Fix file descriptor leak
Fix file descriptor leak

File descriptors to import cover data are left opened.
When we export and import cover data many times,
leaked descriptors cause an error.

msantos/otp,RJ/otp,jamesruan/otp,sammoth-wazoku/otp,stolen/otp,vinoski/otp,beni55/otp,potatosalad/otp,lucafavatella/otp,msantos/otp,erlang/otp,aboroska/otp,emile/otp,dumbbell/otp,bsmr-erlang/otp,falkevik/otp,sdebnath/otp,paulcager/otp,rlipscombe/otp,RGafiyatullin/otp,klarna/otp,rlipscombe/otp,falkevik/otp,vinoski/otp,uabboli/otp,mujiatong/otp,awetzel/otp,legoscia/otp,getong/otp,stolen/otp,vladdu/otp,matwey/otp,RoadRunnr/otp,marquisthunder/otp,cnbin/otp,vic/otp,release-project/otp,aboroska/otp,fenollp/otp,aboroska/otp,vic/otp,c-rack/otp,lemenkov/otp,saleyn/otp,cobusc/otp,RichMorin/otp,bjorng/otp,ahmedshafeeq/otp,mujiatong/otp,matwey/otp,lemenkov/otp,schlagert/otp,potatosalad/otp,getong/otp,sdebnath/otp,theom/otp,entropiae/otp,Teino1978-Corp/erlang-otp,klarna/otp,RaimoNiskanen/otp,paulcager/otp,sitexa/otp,neeraj9/otp,johanclaesson/otp,johanclaesson/otp,weisslj/otp,falkevik/otp,hairyhum/otp,hairyhum/otp,cnbin/otp,benoitc/otp-1,platinumthinker/otp,platinumthinker/otp,RJ/otp,lucafavatella/otp,emacsmirror/erlang,lrascao/otp,mikpe/otp,sitexa/otp,gjaldon/otp,krishnakumar4a4/otp,jamesruan/otp,benoitc/otp-1,Teino1978-Corp/otp,vinoski/otp,RGafiyatullin/otp,NOMORECOFFEE/otp,theom/otp,cnbin/otp,riverrun/otp,cobusc/otp,erlang/otp,uabboli/otp,rlipscombe/otp,RichMorin/otp,bugs-erlang-org/otp,krishnakumar4a4/otp,potatosalad/otp,sitexa/otp,falkevik/otp,riverrun/otp,schlagert/otp,basho/otp,kvakvs/otp,aboroska/otp,schlagert/otp,jemsbhai/otp,falkevik/otp,RoadRunnr/otp,ferd/otp,RJ/otp,jemsbhai/otp,sdebnath/otp,awetzel/otp,entropiae/otp,weisslj/otp,matwey/otp,legoscia/otp,VincentHHL/otp,theom/otp,entropiae/otp,isvilen/otp,gjaldon/otp,dumbbell/otp,matwey/otp,Teino1978-Corp/erlang-otp,RaimoNiskanen/otp,GinjaNinja32/otp,tuncer/otp,release-project/otp,awetzel/otp,sammoth-wazoku/otp,derek121/otp,electricimp/otp,paulcager/otp,benoitc/otp-1,ferd/otp,g-andrade/otp,psyeugenic/otp,RaimoNiskanen/otp,psyeugenic/otp,platinumthinker/otp,dgud/otp,riverrun/otp,VincentHHL/otp,enikki/otp,electricimp/otp,basho/otp,electricimp/otp,c-rack/otp,haguenau/otp,jemsbhai/otp,RichMorin/otp,mikpe/otp,dumbbell/otp,rlipscombe/otp,lianghaivv/otp,vic/otp,massemanet/otp,saleyn/otp,gjaldon/otp,emacsmirror/erlang,bugs-erlang-org/otp,sammoth-wazoku/otp,bjorng/otp,massemanet/otp,jj1bdx/otp,uabboli/otp,marquisthunder/otp,bsmr-erlang/otp,basho/otp,sitexa/otp,emacsmirror/erlang,stolen/otp,derek121/otp,psyeugenic/otp,psyeugenic/otp,kvakvs/otp,falkevik/otp,Teino1978-Corp/otp,lantti/otp,neeraj9/otp,marquisthunder/otp,neeraj9/otp,bernardd/otp,matwey/otp,paladim/otp,emile/otp,tuncer/otp,matwey/otp,lrascao/otp,Teino1978-Corp/otp,msantos/otp,awetzel/otp,release-project/otp,msantos/otp,klarna/otp,rlipscombe/otp,NOMORECOFFEE/otp,release-project/otp,weisslj/otp,saleyn/otp,lrascao/otp,benoitc/otp-1,RGafiyatullin/otp,emile/otp,vinoski/otp,jj1bdx/otp,awetzel/otp,falkevik/otp,ferd/otp,jinshana/otp,sammoth-wazoku/otp,enikki/otp,NOMORECOFFEE/otp,g-andrade/otp,haguenau/otp,awetzel/otp,paulcager/otp,isvilen/otp,dgud/otp,jj1bdx/otp,neeraj9/otp,goertzenator/otp,lrascao/otp,sdebnath/otp,beni55/otp,jamesruan/otp,legoscia/otp,ader1990/otp,jj1bdx/otp,potatosalad/otp,cobusc/otp,basho/otp,Teino1978-Corp/otp,jamesruan/otp,bugs-erlang-org/otp,riverrun/otp,johanclaesson/otp,cobusc/otp,sammoth-wazoku/otp,getong/otp,paladim/otp,mikpe/otp,klarna/otp,VincentHHL/otp,RJ/otp,basho/otp,bjorng/otp,release-project/otp,bernardd/otp,psyeugenic/otp,g-andrade/otp,palas/otp,johanclaesson/otp,dgud/otp,dumbbell/otp,mujiatong/otp,erlang/otp,dgud/otp,getong/otp,haguenau/otp,paladim/otp,theom/otp,dumbbell/otp,NOMORECOFFEE/otp,lightcyphers/otp,bjorng/otp,Teino1978-Corp/otp,saleyn/otp,schlagert/otp,cobusc/otp,bsmr-erlang/otp,lemenkov/otp,awetzel/otp,entropiae/otp,dgud/otp,jemsbhai/otp,RJ/otp,electricimp/otp,bernardd/otp,lightcyphers/otp,derek121/otp,jemsbhai/otp,erlang/otp,massemanet/otp,vladdu/otp,lucafavatella/otp,legoscia/otp,NOMORECOFFEE/otp,bugs-erlang-org/otp,GinjaNinja32/otp,krishnakumar4a4/otp,marquisthunder/otp,tuncer/otp,massemanet/otp,jinshana/otp,RGafiyatullin/otp,jamesruan/otp,isvilen/otp,goertzenator/otp,erlang/otp,getong/otp,schlagert/otp,lianghaivv/otp,emacsmirror/erlang,dgud/otp,rlipscombe/otp,massemanet/otp,hairyhum/otp,lucafavatella/otp,getong/otp,palas/otp,lrascao/otp,tuncer/otp,isvilen/otp,release-project/otp,lightcyphers/otp,theom/otp,lucafavatella/otp,RaimoNiskanen/otp,benoitc/otp-1,basho/otp,RoadRunnr/otp,aboroska/otp,vic/otp,bjorng/otp,beni55/otp,RaimoNiskanen/otp,stolen/otp,GinjaNinja32/otp,vinoski/otp,Teino1978-Corp/otp,release-project/otp,goertzenator/otp,GinjaNinja32/otp,erlang/otp,erlang/otp,lemenkov/otp,vladdu/otp,mikpe/otp,yangchengjian/otp,platinumthinker/otp,derek121/otp,yangchengjian/otp,bsmr-erlang/otp,emile/otp,paladim/otp,tuncer/otp,vic/otp,yangchengjian/otp,RichMorin/otp,haguenau/otp,tuncer/otp,dgud/otp,g-andrade/otp,ferd/otp,bernardd/otp,cobusc/otp,legoscia/otp,enikki/otp,sitexa/otp,emile/otp,lrascao/otp,riverrun/otp,gjaldon/otp,getong/otp,lhslll/otp,g-andrade/otp,msantos/otp,RichMorin/otp,potatosalad/otp,ahmedshafeeq/otp,emacsmirror/erlang,palas/otp,enikki/otp,saleyn/otp,jinshana/otp,theom/otp,potatosalad/otp,lantti/otp,VincentHHL/otp,c-rack/otp,lightcyphers/otp,lantti/otp,GinjaNinja32/otp,jamesruan/otp,beni55/otp,VincentHHL/otp,potatosalad/otp,mujiatong/otp,benoitc/otp-1,ferd/otp,paladim/otp,g-andrade/otp,RaimoNiskanen/otp,lhslll/otp,basho/otp,neeraj9/otp,emacsmirror/erlang,legoscia/otp,neeraj9/otp,saleyn/otp,schlagert/otp,uabboli/otp,derek121/otp,fenollp/otp,weisslj/otp,GinjaNinja32/otp,stolen/otp,legoscia/otp,paladim/otp,basho/otp,vladdu/otp,RJ/otp,gjaldon/otp,johanclaesson/otp,release-project/otp,paulcager/otp,klarna/otp,cnbin/otp,jj1bdx/otp,electricimp/otp,potatosalad/otp,cnbin/otp,palas/otp,beni55/otp,GinjaNinja32/otp,ader1990/otp,derek121/otp,dgud/otp,electricimp/otp,c-rack/otp,lucafavatella/otp,dgud/otp,lantti/otp,isvilen/otp,awetzel/otp,goertzenator/otp,lightcyphers/otp,dumbbell/otp,Teino1978-Corp/otp,electricimp/otp,bugs-erlang-org/otp,lianghaivv/otp,dgud/otp,jamesruan/otp,schlagert/otp,bugs-erlang-org/otp,RJ/otp,jj1bdx/otp,electricimp/otp,jinshana/otp,fenollp/otp,yangchengjian/otp,schlagert/otp,potatosalad/otp,massemanet/otp,klarna/otp,ader1990/otp,stolen/otp,lhslll/otp,fenollp/otp,weisslj/otp,lightcyphers/otp,RGafiyatullin/otp,sammoth-wazoku/otp,mujiatong/otp,bernardd/otp,kvakvs/otp,bernardd/otp,erlang/otp,rlipscombe/otp,Teino1978-Corp/otp,isvilen/otp,jemsbhai/otp,RichMorin/otp,goertzenator/otp,lhslll/otp,derek121/otp,msantos/otp,theom/otp,lianghaivv/otp,ahmedshafeeq/otp,lrascao/otp,lianghaivv/otp,johanclaesson/otp,hairyhum/otp,fenollp/otp,johanclaesson/otp,electricimp/otp,goertzenator/otp,weisslj/otp,yangchengjian/otp,uabboli/otp,massemanet/otp,c-rack/otp,sdebnath/otp,benoitc/otp-1,lucafavatella/otp,lantti/otp,vinoski/otp,matwey/otp,VincentHHL/otp,saleyn/otp,bjorng/otp,weisslj/otp,gjaldon/otp,emile/otp,psyeugenic/otp,bugs-erlang-org/otp,potatosalad/otp,lianghaivv/otp,entropiae/otp,sitexa/otp,palas/otp,bsmr-erlang/otp,paulcager/otp,krishnakumar4a4/otp,tuncer/otp,fenollp/otp,derek121/otp,dumbbell/otp,rlipscombe/otp,cnbin/otp,lantti/otp,lhslll/otp,bernardd/otp,RGafiyatullin/otp,uabboli/otp,mikpe/otp,sitexa/otp,dumbbell/otp,jemsbhai/otp,aboroska/otp,jj1bdx/otp,mikpe/otp,weisslj/otp,getong/otp,basho/otp,uabboli/otp,g-andrade/otp,platinumthinker/otp,jinshana/otp,vinoski/otp,lhslll/otp,theom/otp,beni55/otp,marquisthunder/otp,lantti/otp,haguenau/otp,emacsmirror/erlang,vic/otp,lrascao/otp,lightcyphers/otp,emile/otp,haguenau/otp,aboroska/otp,platinumthinker/otp,bjorng/otp,klarna/otp,platinumthinker/otp,marquisthunder/otp,rlipscombe/otp,hairyhum/otp,platinumthinker/otp,gjaldon/otp,ferd/otp,bernardd/otp,rlipscombe/otp,kvakvs/otp,legoscia/otp,RoadRunnr/otp,lemenkov/otp,msantos/otp,enikki/otp,NOMORECOFFEE/otp,klarna/otp,lianghaivv/otp,krishnakumar4a4/otp,tuncer/otp,kvakvs/otp,bernardd/otp,ader1990/otp,ader1990/otp,vladdu/otp,msantos/otp,ahmedshafeeq/otp,haguenau/otp,ferd/otp,fenollp/otp,vladdu/otp,Teino1978-Corp/erlang-otp,Teino1978-Corp/erlang-otp,weisslj/otp,sdebnath/otp,fenollp/otp,matwey/otp,g-andrade/otp,g-andrade/otp,lemenkov/otp,enikki/otp,krishnakumar4a4/otp,uabboli/otp,uabboli/otp,stolen/otp,ader1990/otp,mujiatong/otp,vladdu/otp,neeraj9/otp,bjorng/otp,emacsmirror/erlang,lhslll/otp,Teino1978-Corp/erlang-otp,massemanet/otp,kvakvs/otp,hairyhum/otp,riverrun/otp,legoscia/otp,sammoth-wazoku/otp,bsmr-erlang/otp,lightcyphers/otp,lhslll/otp,c-rack/otp,c-rack/otp,emacsmirror/erlang,jinshana/otp,paulcager/otp,release-project/otp,vinoski/otp,neeraj9/otp,psyeugenic/otp,bjorng/otp,enikki/otp,jj1bdx/otp,c-rack/otp,falkevik/otp,jj1bdx/otp,ahmedshafeeq/otp,yangchengjian/otp,massemanet/otp,bsmr-erlang/otp,RGafiyatullin/otp,krishnakumar4a4/otp,palas/otp,yangchengjian/otp,jamesruan/otp,bugs-erlang-org/otp,ader1990/otp,RaimoNiskanen/otp,ferd/otp,ahmedshafeeq/otp,marquisthunder/otp,tuncer/otp,RichMorin/otp,cnbin/otp,lemenkov/otp,Teino1978-Corp/erlang-otp,RoadRunnr/otp,benoitc/otp-1,krishnakumar4a4/otp,emile/otp,ahmedshafeeq/otp,RichMorin/otp,mujiatong/otp,palas/otp,cobusc/otp,vinoski/otp,bsmr-erlang/otp,mikpe/otp,sitexa/otp,RoadRunnr/otp,saleyn/otp,RaimoNiskanen/otp,RJ/otp,erlang/otp,lantti/otp,mikpe/otp,sdebnath/otp,RoadRunnr/otp,riverrun/otp,GinjaNinja32/otp,vladdu/otp,vic/otp,RoadRunnr/otp,kvakvs/otp,g-andrade/otp,jemsbhai/otp,Teino1978-Corp/erlang-otp,kvakvs/otp,mikpe/otp,VincentHHL/otp,goertzenator/otp,emacsmirror/erlang,jinshana/otp,palas/otp,isvilen/otp,entropiae/otp,sdebnath/otp,getong/otp,isvilen/otp,jinshana/otp,mujiatong/otp,jj1bdx/otp,gjaldon/otp,ahmedshafeeq/otp,RaimoNiskanen/otp,vic/otp,RGafiyatullin/otp,paladim/otp,lemenkov/otp,paulcager/otp,Teino1978-Corp/erlang-otp,sammoth-wazoku/otp,hairyhum/otp,ferd/otp,emile/otp,fenollp/otp,RoadRunnr/otp,bsmr-erlang/otp,marquisthunder/otp,aboroska/otp,beni55/otp,saleyn/otp,vinoski/otp,johanclaesson/otp,erlang/otp,isvilen/otp,NOMORECOFFEE/otp,NOMORECOFFEE/otp,beni55/otp,vladdu/otp,falkevik/otp,goertzenator/otp,lucafavatella/otp,mikpe/otp,lianghaivv/otp,matwey/otp,dumbbell/otp,haguenau/otp,enikki/otp,VincentHHL/otp,goertzenator/otp,dumbbell/otp,bjorng/otp,cobusc/otp,ahmedshafeeq/otp,aboroska/otp,isvilen/otp,paladim/otp,yangchengjian/otp,cnbin/otp,entropiae/otp,psyeugenic/otp,riverrun/otp,ader1990/otp,stolen/otp,lrascao/otp,entropiae/otp,kvakvs/otp,getong/otp,hairyhum/otp