qemu: plug memory leak
qemu: plug memory leak

Detected by Coverity. Leak introduced in commit 6cabc0b.

* src/qemu/qemu_command.c: Clean up on failure.

Signed-off-by: Alex Jia <e236faec8cb8371bfb245ba3769a84afc9a11438@redhat.com>

elmarco/libvirt,leilihh/libvirt,shugaoye/libvirt,iam-TJ/libvirt,iam-TJ/libvirt,dumbbell/libvirt,rlaager/libvirt,jeckersb/libvirt,taget/libvirt,libvirt/libvirt,jeckersb/libvirt,datto/libvirt,trainstack/libvirt,danwent/libvirt-ovs,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,andreabolognani/libvirt,trainstack/libvirt,danwent/libvirt-ovs,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,novel/fbsd-libvirt,andreabolognani/libvirt,wiedi/libvirt,eskultety/libvirt,novel/fbsd-libvirt,jeckersb/libvirt,leilihh/libvirt,danwent/libvirt-ovs,bjzhang/libvirt,fabianfreyer/libvirt,usc-isi/libvirt,shugaoye/libvirt,usc-isi/libvirt,rmarwaha/libvirt1,dumbbell/libvirt,zippy2/libvirt,warewolf/libvirt,bjzhang/libvirt,rlaager/libvirt,foomango/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,emaste/libvirt,agx/libvirt,dumbbell/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,leilihh/libvirt,wiedi/libvirt,shugaoye/libvirt,dumbbell/libvirt,wiedi/libvirt,emaste/libvirt,datto/libvirt,iam-TJ/libvirt,jardasgit/libvirt,jeckersb/libvirt,emaste/libvirt,agx/libvirt,andreabolognani/libvirt,jeckersb/libvirt,danwent/libvirt-ovs,rmarwaha/libvirt,emaste/libvirt,foomango/libvirt,rmarwaha/libvirt1,cbosdo/libvirt,nertpinx/libvirt,danwent/libvirt-ovs,VenkatDatta/libvirt,nertpinx/libvirt,novel/fbsd-libvirt,crobinso/libvirt,jfehlig/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt,jeckersb/libvirt,fabianfreyer/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,jardasgit/libvirt,elmarco/libvirt,rmarwaha/libvirt1,andreabolognani/libvirt,siboulet/libvirt-openvz,novel/fbsd-libvirt,foomango/libvirt,fabianfreyer/libvirt,foomango/libvirt,nertpinx/libvirt,jfehlig/libvirt,andreabolognani/libvirt,taget/libvirt,taget/libvirt,rmarwaha/libvirt,nertpinx/libvirt,olafhering/libvirt,emaste/libvirt,wiedi/libvirt,libvirt/libvirt,elmarco/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,rlaager/libvirt,jardasgit/libvirt,agx/libvirt,usc-isi/libvirt,siboulet/libvirt-openvz,emaste/libvirt,rmarwaha/libvirt,wiedi/libvirt,bjzhang/libvirt,siboulet/libvirt-openvz,warewolf/libvirt,rlaager/libvirt,jardasgit/libvirt,bjzhang/libvirt,warewolf/libvirt,leilihh/libvirt,eskultety/libvirt,shugaoye/libvirt,foomango/libvirt,jfehlig/libvirt,taget/libvirt,rmarwaha/libvirt,elmarco/libvirt,libvirt/libvirt,trainstack/libvirt,VenkatDatta/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,rmarwaha/libvirt1,datto/libvirt,agx/libvirt,olafhering/libvirt,leilihh/libvirt,elmarco/libvirt,leilihh/libvirt,zippy2/libvirt,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,rlaager/libvirt,nertpinx/libvirt,usc-isi/libvirt,novel/fbsd-libvirt,usc-isi/libvirt,dumbbell/libvirt,eskultety/libvirt,datto/libvirt,warewolf/libvirt,rmarwaha/libvirt1,wiedi/libvirt,fabianfreyer/libvirt,eskultety/libvirt,agx/libvirt,olafhering/libvirt,fabianfreyer/libvirt,novel/fbsd-libvirt,taget/libvirt,iam-TJ/libvirt,emaste/libvirt,cbosdo/libvirt,datto/libvirt,trainstack/libvirt,wiedi/libvirt,shugaoye/libvirt,iam-TJ/libvirt,libvirt/libvirt,cbosdo/libvirt,crobinso/libvirt,rmarwaha/libvirt,warewolf/libvirt,warewolf/libvirt,rmarwaha/libvirt1,zippy2/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,jfehlig/libvirt,dumbbell/libvirt,trainstack/libvirt,jeckersb/libvirt,zippy2/libvirt,cbosdo/libvirt,warewolf/libvirt