Eliminate unmatched return dialyzer warnings
Eliminate unmatched return dialyzer warnings

The code contained a lot of unmatched return warnings, mostly in function
calls that were executed only for their side-effects.  Also, there were
various places where possible errors were not checked and now they are.
This may cause crashes, both in the ftp testsuite (which I have not run)
and in situations were errors occur but are ignored.

aboroska/otp,vinoski/otp,RaimoNiskanen/otp,rlipscombe/otp,bjorng/otp,mikpe/otp,dgud/otp,tuncer/otp,uabboli/otp,rlipscombe/otp,dumbbell/otp,saleyn/otp,cobusc/otp,jj1bdx/otp,matwey/otp,dgud/otp,g-andrade/otp,goertzenator/otp,jj1bdx/otp,legoscia/otp,ferd/otp,massemanet/otp,bernardd/otp,legoscia/otp,goertzenator/otp,bernardd/otp,dgud/otp,vinoski/otp,weisslj/otp,goertzenator/otp,erlang/otp,massemanet/otp,g-andrade/otp,emile/otp,electricimp/otp,dumbbell/otp,dumbbell/otp,dgud/otp,getong/otp,bernardd/otp,emacsmirror/erlang,getong/otp,dumbbell/otp,lrascao/otp,emile/otp,bsmr-erlang/otp,potatosalad/otp,goertzenator/otp,electricimp/otp,uabboli/otp,bernardd/otp,bjorng/otp,mikpe/otp,erlang/otp,fenollp/otp,rlipscombe/otp,ferd/otp,vinoski/otp,isvilen/otp,falkevik/otp,RaimoNiskanen/otp,vinoski/otp,saleyn/otp,bjorng/otp,getong/otp,cobusc/otp,dumbbell/otp,g-andrade/otp,emacsmirror/erlang,weisslj/otp,massemanet/otp,vinoski/otp,RoadRunnr/otp,ferd/otp,aboroska/otp,dumbbell/otp,massemanet/otp,matwey/otp,cobusc/otp,release-project/otp,dgud/otp,fenollp/otp,vinoski/otp,dumbbell/otp,weisslj/otp,bjorng/otp,ferd/otp,erlang/otp,bjorng/otp,legoscia/otp,saleyn/otp,RoadRunnr/otp,legoscia/otp,massemanet/otp,ferd/otp,matwey/otp,isvilen/otp,tuncer/otp,isvilen/otp,emacsmirror/erlang,erlang/otp,isvilen/otp,ferd/otp,mikpe/otp,getong/otp,electricimp/otp,potatosalad/otp,release-project/otp,potatosalad/otp,g-andrade/otp,jj1bdx/otp,rlipscombe/otp,emile/otp,bjorng/otp,bsmr-erlang/otp,falkevik/otp,matwey/otp,release-project/otp,mikpe/otp,bsmr-erlang/otp,falkevik/otp,vladdu/otp,mikpe/otp,g-andrade/otp,weisslj/otp,release-project/otp,rlipscombe/otp,RaimoNiskanen/otp,erlang/otp,RaimoNiskanen/otp,cobusc/otp,jj1bdx/otp,bernardd/otp,matwey/otp,emile/otp,weisslj/otp,bernardd/otp,saleyn/otp,RaimoNiskanen/otp,rlipscombe/otp,uabboli/otp,electricimp/otp,emacsmirror/erlang,erlang/otp,tuncer/otp,potatosalad/otp,emile/otp,dgud/otp,uabboli/otp,erlang/otp,emacsmirror/erlang,bjorng/otp,emacsmirror/erlang,tuncer/otp,cobusc/otp,jj1bdx/otp,jj1bdx/otp,ferd/otp,lrascao/otp,erlang/otp,kvakvs/otp,dgud/otp,electricimp/otp,legoscia/otp,dgud/otp,emile/otp,potatosalad/otp,fenollp/otp,emacsmirror/erlang,uabboli/otp,electricimp/otp,g-andrade/otp,bjorng/otp,release-project/otp,aboroska/otp,bjorng/otp,mikpe/otp,electricimp/otp,kvakvs/otp,rlipscombe/otp,release-project/otp,emile/otp,massemanet/otp,dgud/otp,potatosalad/otp,massemanet/otp,erlang/otp,getong/otp,rlipscombe/otp,RaimoNiskanen/otp,jj1bdx/otp,rlipscombe/otp,uabboli/otp,weisslj/otp,RoadRunnr/otp,bsmr-erlang/otp,vladdu/otp,isvilen/otp,release-project/otp,mikpe/otp,weisslj/otp,lrascao/otp,aboroska/otp,ferd/otp,emacsmirror/erlang,saleyn/otp,vladdu/otp,ferd/otp,potatosalad/otp,rlipscombe/otp,vinoski/otp,getong/otp,aboroska/otp,fenollp/otp,tuncer/otp,vladdu/otp,bsmr-erlang/otp,RaimoNiskanen/otp,RoadRunnr/otp,falkevik/otp,isvilen/otp,bernardd/otp,dumbbell/otp,jj1bdx/otp,tuncer/otp,goertzenator/otp,bernardd/otp,vladdu/otp,isvilen/otp,potatosalad/otp,vinoski/otp,falkevik/otp,getong/otp,saleyn/otp,kvakvs/otp,weisslj/otp,kvakvs/otp,jj1bdx/otp,RoadRunnr/otp,isvilen/otp,kvakvs/otp,fenollp/otp,matwey/otp,aboroska/otp,jj1bdx/otp,kvakvs/otp,fenollp/otp,bsmr-erlang/otp,release-project/otp,kvakvs/otp,g-andrade/otp,mikpe/otp,dgud/otp,potatosalad/otp,uabboli/otp,falkevik/otp,vladdu/otp,lrascao/otp,RaimoNiskanen/otp,bjorng/otp,legoscia/otp,RaimoNiskanen/otp,saleyn/otp,uabboli/otp,RoadRunnr/otp,bsmr-erlang/otp,cobusc/otp,mikpe/otp,g-andrade/otp,massemanet/otp,uabboli/otp,dumbbell/otp,weisslj/otp,goertzenator/otp,goertzenator/otp,goertzenator/otp,lrascao/otp,emile/otp,emacsmirror/erlang,vladdu/otp,RoadRunnr/otp,bsmr-erlang/otp,bsmr-erlang/otp,aboroska/otp,legoscia/otp,vladdu/otp,tuncer/otp,cobusc/otp,electricimp/otp,kvakvs/otp,lrascao/otp,lrascao/otp,g-andrade/otp,isvilen/otp,getong/otp,goertzenator/otp,g-andrade/otp,emacsmirror/erlang,release-project/otp,RoadRunnr/otp,falkevik/otp,saleyn/otp,fenollp/otp,mikpe/otp,erlang/otp,vladdu/otp,isvilen/otp,tuncer/otp,aboroska/otp,electricimp/otp,potatosalad/otp,kvakvs/otp,lrascao/otp,massemanet/otp,matwey/otp,matwey/otp,RoadRunnr/otp,lrascao/otp,matwey/otp,legoscia/otp,fenollp/otp,getong/otp,falkevik/otp,cobusc/otp,saleyn/otp,emile/otp,vinoski/otp,tuncer/otp,vinoski/otp,getong/otp,bernardd/otp,fenollp/otp,dumbbell/otp,falkevik/otp,legoscia/otp,aboroska/otp