util: Remove ATTRIBUTE_NONNULL from virNetDevTapInterfaceStats
util: Remove ATTRIBUTE_NONNULL from virNetDevTapInterfaceStats

Commit id 318d54e520 altered the code to check for a NULL
first parameter, but neglected to alter the prototype.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

jardasgit/libvirt,olafhering/libvirt,andreabolognani/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,andreabolognani/libvirt,zippy2/libvirt,eskultety/libvirt,zippy2/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,zippy2/libvirt,jardasgit/libvirt,crobinso/libvirt,jfehlig/libvirt,eskultety/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jfehlig/libvirt,crobinso/libvirt,jardasgit/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,crobinso/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,olafhering/libvirt,eskultety/libvirt,nertpinx/libvirt,andreabolognani/libvirt,eskultety/libvirt,nertpinx/libvirt,libvirt/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt