scsi: fc: provide fc_bsg_to_rport() helper

Provide fc_bsg_to_rport() helper that will become handy when we're
moving from struct fc_bsg_job to a plain struct bsg_job. Also move all
LLDDs to use the new helper.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_bsg.c

@@ -264,7 +264,7 @@ qla2x00_process_els(struct fc_bsg_job *bsg_job)
 	uint16_t nextlid = 0;
 
 	if (bsg_request->msgcode == FC_BSG_RPT_ELS) {
-		rport = bsg_job->rport;
+		rport = fc_bsg_to_rport(bsg_job);
 		fcport = *(fc_port_t **) rport->dd_data;
 		host = rport_to_shost(rport);
 		vha = shost_priv(host);
@@ -2485,7 +2485,7 @@ qla24xx_bsg_request(struct fc_bsg_job *bsg_job)
 	bsg_reply->reply_payload_rcv_len = 0;
 
 	if (bsg_request->msgcode == FC_BSG_RPT_ELS) {
-		rport = bsg_job->rport;
+		rport = fc_bsg_to_rport(bsg_job);
 		host = rport_to_shost(rport);
 		vha = shost_priv(host);
 	} else {