scsi: libfc: do not overwrite DID_TIME_OUT status

When a command is aborted it might already have the DID_TIME_OUT
status set, so we shouldn't be overwriting that.

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>