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

Detected by smatch.

Fixes: 17865dc2 ("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>