IB/usnic: Fix error return code

If 'pci_register_driver' fails, we return 'err' which is known to be 0.
Return the error instead.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Christophe Jaillet 2016-08-10 17:45:01 +02:00 • committed by Doug Ledford
commit 86cd747c6d