conf: duplicate interface name instead of MAC provided to lookup the interface
conf: duplicate interface name instead of MAC provided to lookup the interface

Introduced by 6094d6ec7fc9ea3e28c18c880b76858f06a8b129.
Found by running libvirt-perl tests.

Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Signed-off-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

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