scsi: qla2xxx: Make qla2x00_restart_isp() easier to read

Instead of using complicated control flow to only have one return statement
at the end of qla2x00_restart_isp(), return an error status as soon as it
is known that this function will fail.

Link: https://lore.kernel.org/r/20200629225454.22863-9-bvanassche@acm.org
Cc: Nilesh Javali <njavali@marvell.com>
Cc: Quinn Tran <qutran@marvell.com>
Cc: Himanshu Madhani <himanshu.madhani@oracle.com>
Cc: Martin Wilck <mwilck@suse.com>
Cc: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_init.c

@@ -6996,18 +6996,24 @@ qla2x00_abort_isp(scsi_qla_host_t *vha)
 static int
 qla2x00_restart_isp(scsi_qla_host_t *vha)
 {
-	int status = 0;
+	int status;
 	struct qla_hw_data *ha = vha->hw;
 
 	/* If firmware needs to be loaded */
 	if (qla2x00_isp_firmware(vha)) {
 		vha->flags.online = 0;
 		status = ha->isp_ops->chip_diag(vha);
-		if (!status)
+		if (status)
+			return status;
 		status = qla2x00_setup_chip(vha);
+		if (status)
+			return status;
 	}
 
-	if (!status && !(status = qla2x00_init_rings(vha))) {
+	status = qla2x00_init_rings(vha);
+	if (status)
+		return status;
+
 	clear_bit(RESET_MARKER_NEEDED, &vha->dpc_flags);
 	ha->flags.chip_reset_done = 1;
 
@@ -7015,17 +7021,16 @@ qla2x00_restart_isp(scsi_qla_host_t *vha)
 	qla25xx_init_queues(ha);
 
 	status = qla2x00_fw_ready(vha);
-		if (!status) {
+	if (status) {
+		/* if no cable then assume it's good */
+		return vha->device_flags & DFLG_NO_CABLE ? 0 : status;
+	}
+
 	/* Issue a marker after FW becomes ready. */
 	qla2x00_marker(vha, ha->base_qpair, 0, 0, MK_SYNC_ALL);
 	set_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags);
-		}
 
-		/* if no cable then assume it's good */
-		if ((vha->device_flags & DFLG_NO_CABLE))
-			status = 0;
-	}
-	return (status);
+	return 0;
 }
 
 static int