scsi: libfc: Replace ->seq_release callback with function call

The ->seq_release callback only ever had one implementation,
so call the function directly and drop the callback.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Acked-by: Johannes Thumshirn <jth@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>