lxc_start: free the conf if starting the container fails
lxc_start: free the conf if starting the container fails

When running lxc-start command with valgrind, it reports a memory leak error.
When lxc-start command fails, the conf which is from malloc has not been released.
This patch fix the problem.

Signed-off-by: Weng Meiling <1c2ffc98dae56b3d68b4a6e96a296f2035e8909a@huawei.com>
Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

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