coverity: Check return value of fcntl in lxc_popen
coverity: Check return value of fcntl in lxc_popen

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>
Acked-by: Serge E. Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

DarknessBeforeDawn/lxc,rldleblanc/lxc,hkjolhede/lxc,Ponce/lxc,rowhit/lxc,lisongmin/lxc,sapun/lxc,virajs/lxc,szaszg/lxc,christiaan/lxc,Distrotech/lxc,Pelagicore/lxc,codebauss/lxc,ss1h2a3tw/lxc,tych0/lxc,efiop/lxc,armcc/lxc,LynxChaus/lxc,JohnPeacockMessageSystems/lxc,JohnPeacockMessageSystems/lxc,bmoar/lxc,thmo/lxc,akshaykarle/lxc,major/lxc,jirislaby/lxc,Distrotech/lxc,terceiro/lxc,ecarrara/lxc,caglar10ur/lxc,ioops/lxc,tych0/lxc,hfuCN/lxc,ysbnim/lxc,federicobriata/lxc,rldleblanc/lxc,akshaykarle/lxc,rowhit/lxc,hfuCN/lxc,Pelagicore/lxc,federicobriata/lxc,sapun/lxc,codebauss/lxc,hfuCN/lxc,LynxChaus/lxc,raspberrypython/lxc,weizhenwei/lxc,weizhenwei/lxc,jirislaby/lxc,federicobriata/lxc,hkjolhede/lxc,bmoar/lxc,lazy404/lxc,lisongmin/lxc,ksperis/lxc,cjwatson/lxc,ojkastl/lxc_Patches,ss1h2a3tw/lxc,virajs/lxc,bostjan/lxc,ojkastl/lxc_Patches,yubo/lxc,bmoar/lxc,christiaan/lxc,lazy404/lxc,GreatFruitOmsk/lxc,rowhit/lxc,ojkastl/lxc_Patches,Distrotech/lxc,virajs/lxc,regit/lxc,raspberrypython/lxc,fwilson42/lxc,Ponce/lxc,DarknessBeforeDawn/lxc,Pelagicore/lxc,terceiro/lxc,caglar10ur/lxc,bostjan/lxc,hkjolhede/lxc,cjwatson/lxc,weizhenwei/lxc,cjwatson/lxc,ecarrara/lxc,JohnPeacockMessageSystems/lxc,rldleblanc/lxc,DarknessBeforeDawn/lxc,regit/lxc,lisongmin/lxc,armcc/lxc,LynxChaus/lxc,hallyn/lxc,christiaan/lxc,terceiro/lxc,efiop/lxc,fwilson42/lxc,codebauss/lxc,armcc/lxc,ioops/lxc,hallyn/lxc,raspberrypython/lxc,GreatFruitOmsk/lxc,ojkastl/lxc_Patches,szaszg/lxc,fwilson42/lxc,hallyn/lxc,efiop/lxc,QingweiPeterLan/cs188-lxc,jirislaby/lxc,yubo/lxc,aeris/lxc,thmo/lxc,thmo/lxc,QingweiPeterLan/cs188-lxc,lazy404/lxc,ss1h2a3tw/lxc,ysbnim/lxc,GreatFruitOmsk/lxc,major/lxc,bostjan/lxc,ksperis/lxc,ksperis/lxc,caglar10ur/lxc,ioops/lxc,major/lxc,aeris/lxc,szaszg/lxc,ysbnim/lxc,ecarrara/lxc,akshaykarle/lxc,aeris/lxc,yubo/lxc,tych0/lxc,Ponce/lxc,regit/lxc,QingweiPeterLan/cs188-lxc,sapun/lxc