scsi: libfc: free response frame from GPN_ID

fc_disc_gpn_id_resp() should be the last function using it so free it here
to avoid memory leak.

Link: https://lore.kernel.org/r/1579013000-14570-2-git-send-email-igor.druzhinin@citrix.com


Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>