scsi: core: return BLK_STS_OK for DID_OK in __scsi_error_from_host_byte()

When converting __scsi_error_from_host_byte() to BLK_STS error codes the
case DID_OK was forgotten, resulting in it always returning an error.

Fixes: 2a842aca ("block: introduce new block status code type")
Cc: Doug Gilbert <dgilbert@interlog.com>
Signed-off-by: NHannes Reinecke <hare@suse.com>
Reviewed-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_lib.c

@@ -720,6 +720,8 @@ static blk_status_t __scsi_error_from_host_byte(struct scsi_cmnd *cmd,
 		int result)
 {
 	switch (host_byte(result)) {
+	case DID_OK:
+		return BLK_STS_OK;
 	case DID_TRANSPORT_FAILFAST:
 		return BLK_STS_TRANSPORT;
 	case DID_TARGET_FAILURE: