cgroup: Remove unused mntent variables
cgroup: Remove unused mntent variables

Spotted by coverity, we were now assigning mntent but only every using
mntent_r, so drop those variables and assignation.

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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