scsi: st: Return error code in st_scsi_execute()

The callers to st_scsi_execute() already check for negative return values,
so we can drop the use of DRIVER_ERROR and return the actual error code.

Link: https://lore.kernel.org/r/20210427083046.31620-2-hare@suse.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/st.c

@@ -551,7 +551,7 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
 			data_direction == DMA_TO_DEVICE ?
 			REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
 	if (IS_ERR(req))
-		return DRIVER_ERROR << 24;
+		return PTR_ERR(req);
 	rq = scsi_req(req);
 	req->rq_flags |= RQF_QUIET;
 
@@ -562,7 +562,7 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
 				      GFP_KERNEL);
 		if (err) {
 			blk_put_request(req);
-			return DRIVER_ERROR << 24;
+			return err;
 		}
 	}