pci: eliminate leak in OOM condition
pci: eliminate leak in OOM condition

The "fix" I pushed a few commits ago would still leak a virPCIDevice
in case of an OOM error. Although it's inconsequential in practice,
this patch satisfies my OCD.

datto/libvirt,agx/libvirt,taget/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jardasgit/libvirt,olafhering/libvirt,nertpinx/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,libvirt/libvirt,rlaager/libvirt,jardasgit/libvirt,olafhering/libvirt,rlaager/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,elmarco/libvirt,cbosdo/libvirt,nertpinx/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,zippy2/libvirt,datto/libvirt,shugaoye/libvirt,elmarco/libvirt,datto/libvirt,andreabolognani/libvirt,shugaoye/libvirt,zippy2/libvirt,zippy2/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,shugaoye/libvirt,eskultety/libvirt,elmarco/libvirt,agx/libvirt,libvirt/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,fabianfreyer/libvirt,taget/libvirt,cbosdo/libvirt,rlaager/libvirt,andreabolognani/libvirt,taget/libvirt,olafhering/libvirt,eskultety/libvirt,elmarco/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,agx/libvirt,taget/libvirt,shugaoye/libvirt,rlaager/libvirt,jfehlig/libvirt,datto/libvirt,eskultety/libvirt,datto/libvirt,jfehlig/libvirt,andreabolognani/libvirt,jfehlig/libvirt,shugaoye/libvirt,crobinso/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,cbosdo/libvirt,taget/libvirt,agx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt