Fix initialization of virCommandPtr when creating QEMU argv
Fix initialization of virCommandPtr when creating QEMU argv

If the qemuBuildCommandLine method raised an error before the
virCommandPtr instance was created, the local var would not
be initialized, resulting in a possible SEGV in the error
cleanup branch. Also add some debugging of the method params

olafhering/libvirt,zippy2/libvirt,rlaager/libvirt,libvirt/libvirt,bjzhang/libvirt,bjzhang/libvirt,nertpinx/libvirt,jardasgit/libvirt,novel/fbsd-libvirt,taget/libvirt,iam-TJ/libvirt,rlaager/libvirt,fabianfreyer/libvirt,agx/libvirt,emaste/libvirt,elmarco/libvirt,emaste/libvirt,eskultety/libvirt,jeckersb/libvirt,iam-TJ/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,siboulet/libvirt-openvz,eskultety/libvirt,siboulet/libvirt-openvz,agx/libvirt,rlaager/libvirt,shugaoye/libvirt,andreabolognani/libvirt,cbosdo/libvirt,emaste/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,elmarco/libvirt,trainstack/libvirt,jardasgit/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,warewolf/libvirt,cbosdo/libvirt,iam-TJ/libvirt,zippy2/libvirt,iam-TJ/libvirt,elmarco/libvirt,libvirt/libvirt,taget/libvirt,jeckersb/libvirt,datto/libvirt,trainstack/libvirt,jeckersb/libvirt,emaste/libvirt,VenkatDatta/libvirt,datto/libvirt,taget/libvirt,bjzhang/libvirt,rlaager/libvirt,jardasgit/libvirt,taget/libvirt,shugaoye/libvirt,trainstack/libvirt,warewolf/libvirt,crobinso/libvirt,datto/libvirt,zippy2/libvirt,VenkatDatta/libvirt,datto/libvirt,trainstack/libvirt,warewolf/libvirt,libvirt/libvirt,agx/libvirt,andreabolognani/libvirt,novel/fbsd-libvirt,cbosdo/libvirt,novel/fbsd-libvirt,warewolf/libvirt,iam-TJ/libvirt,siboulet/libvirt-openvz,taget/libvirt,warewolf/libvirt,zippy2/libvirt,VenkatDatta/libvirt,eskultety/libvirt,jeckersb/libvirt,andreabolognani/libvirt,warewolf/libvirt,novel/fbsd-libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,jeckersb/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,emaste/libvirt,eskultety/libvirt,novel/fbsd-libvirt,nertpinx/libvirt,crobinso/libvirt,emaste/libvirt,iam-TJ/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,novel/fbsd-libvirt,shugaoye/libvirt,agx/libvirt,shugaoye/libvirt,siboulet/libvirt-openvz,fabianfreyer/libvirt,jardasgit/libvirt,jfehlig/libvirt,siboulet/libvirt-openvz,emaste/libvirt,trainstack/libvirt,agx/libvirt,olafhering/libvirt,jeckersb/libvirt,jardasgit/libvirt,jfehlig/libvirt,olafhering/libvirt,novel/fbsd-libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,trainstack/libvirt,nertpinx/libvirt,shugaoye/libvirt,jeckersb/libvirt,cbosdo/libvirt,olafhering/libvirt,elmarco/libvirt,bjzhang/libvirt,jfehlig/libvirt,warewolf/libvirt,libvirt/libvirt,cbosdo/libvirt,crobinso/libvirt,bjzhang/libvirt,trainstack/libvirt,VenkatDatta/libvirt,iam-TJ/libvirt,elmarco/libvirt,novel/fbsd-libvirt