scsi: message: fusion: Initialize return value in mptfc_bus_reset()

Detected by smatch.

Fixes: 17865dc ("scsi: message: fusion: Open-code mptfc_block_error_handler() for bus reset")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20231023073005.20766-1-hare@suse.de
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: hreinecke

drivers/message/fusion/mptfc.c

@@ -265,7 +265,7 @@ mptfc_bus_reset(struct scsi_cmnd *SCpnt)
 	MPT_SCSI_HOST __maybe_unused *hd = shost_priv(shost);
 	int channel = SCpnt->device->channel;
 	struct mptfc_rport_info *ri;
-	int rtn;
+	int rtn = FAILED;
 
 	list_for_each_entry(ri, &hd->ioc->fc_rports, list) {
 		if (ri->flags & MPT_RPORT_INFO_FLAGS_REGISTERED) {