node device: Fix locking issue in virNodeDeviceDestroy
node device: Fix locking issue in virNodeDeviceDestroy

Certain error paths won't unlock the node device object.

zhlcindy/libvirt-1.1.4-maintain,emaste/libvirt,elmarco/libvirt,libvirt/libvirt,datto/libvirt,datto/libvirt,siboulet/libvirt-openvz,zippy2/libvirt,rmarwaha/libvirt,VenkatDatta/libvirt,leilihh/libvirt,agx/libvirt,nertpinx/libvirt,trainstack/libvirt,andreabolognani/libvirt,foomango/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,novel/fbsd-libvirt,elmarco/libvirt,crobinso/libvirt,dumbbell/libvirt,novel/fbsd-libvirt,novel/fbsd-libvirt,taget/libvirt,novel/fbsd-libvirt,shugaoye/libvirt,jardasgit/libvirt,andreabolognani/libvirt,cbosdo/libvirt,soulxu/libvirt-xuhj,iam-TJ/libvirt,libvirt/libvirt,taget/libvirt,rbu/libvirt,soulxu/libvirt-xuhj,zhlcindy/libvirt-1.1.4-maintain,bjzhang/libvirt,iam-TJ/libvirt,warewolf/libvirt,rlaager/libvirt,foomango/libvirt,trainstack/libvirt,cbosdo/libvirt,bjzhang/libvirt,novel/fbsd-libvirt,jardasgit/libvirt,jfehlig/libvirt,zippy2/libvirt,taget/libvirt,siboulet/libvirt-openvz,crobinso/libvirt,leilihh/libvirt,jfehlig/libvirt,iam-TJ/libvirt,wiedi/libvirt,dumbbell/libvirt,emaste/libvirt,amery/libvirt-vserver,jeckersb/libvirt,wiedi/libvirt,andreabolognani/libvirt,agx/libvirt,jardasgit/libvirt,rlaager/libvirt,bjzhang/libvirt,jeckersb/libvirt,siboulet/libvirt-openvz,agx/libvirt,rbu/libvirt,rlaager/libvirt,rmarwaha/libvirt1,fabianfreyer/libvirt,datto/libvirt,danwent/libvirt-ovs,VenkatDatta/libvirt,andreabolognani/libvirt,siboulet/libvirt-openvz,nertpinx/libvirt,usc-isi/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,rmarwaha/libvirt1,VenkatDatta/libvirt,foomango/libvirt,rbu/libvirt,olafhering/libvirt,jfehlig/libvirt,soulxu/libvirt-xuhj,crobinso/libvirt,leilihh/libvirt,usc-isi/libvirt,cbosdo/libvirt,agx/libvirt,soulxu/libvirt-xuhj,novel/fbsd-libvirt,kantai/libvirt-vfork,fabianfreyer/libvirt,emaste/libvirt,usc-isi/libvirt,jardasgit/libvirt,warewolf/libvirt,VenkatDatta/libvirt,amery/libvirt-vserver,amery/libvirt-vserver,wiedi/libvirt,libvirt/libvirt,leilihh/libvirt,amery/libvirt-vserver,kantai/libvirt-vfork,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,rmarwaha/libvirt,danwent/libvirt-ovs,eskultety/libvirt,rmarwaha/libvirt,danwent/libvirt-ovs,wiedi/libvirt,warewolf/libvirt,shugaoye/libvirt,rmarwaha/libvirt,iam-TJ/libvirt,wiedi/libvirt,foomango/libvirt,zippy2/libvirt,olafhering/libvirt,olafhering/libvirt,warewolf/libvirt,danwent/libvirt-ovs,dumbbell/libvirt,rmarwaha/libvirt,elmarco/libvirt,warewolf/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,leilihh/libvirt,jeckersb/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jeckersb/libvirt,eskultety/libvirt,rmarwaha/libvirt1,shugaoye/libvirt,foomango/libvirt,bjzhang/libvirt,elmarco/libvirt,warewolf/libvirt,andreabolognani/libvirt,jeckersb/libvirt,trainstack/libvirt,eskultety/libvirt,emaste/libvirt,rlaager/libvirt,rmarwaha/libvirt1,olafhering/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,shugaoye/libvirt,dumbbell/libvirt,soulxu/libvirt-xuhj,rmarwaha/libvirt,danwent/libvirt-ovs,emaste/libvirt,leilihh/libvirt,emaste/libvirt,rbu/libvirt,dumbbell/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,trainstack/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,iam-TJ/libvirt,datto/libvirt,wiedi/libvirt,jeckersb/libvirt,trainstack/libvirt,rlaager/libvirt,jeckersb/libvirt,novel/fbsd-libvirt,wiedi/libvirt,kantai/libvirt-vfork,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,elmarco/libvirt,rmarwaha/libvirt1,dumbbell/libvirt,cbosdo/libvirt,rbu/libvirt,trainstack/libvirt,kantai/libvirt-vfork,libvirt/libvirt,nertpinx/libvirt,shugaoye/libvirt,siboulet/libvirt-openvz,usc-isi/libvirt,crobinso/libvirt,jardasgit/libvirt,usc-isi/libvirt,warewolf/libvirt,taget/libvirt,kantai/libvirt-vfork,agx/libvirt,jfehlig/libvirt,emaste/libvirt,cbosdo/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,amery/libvirt-vserver,iam-TJ/libvirt,trainstack/libvirt,novel/fbsd-libvirt