[SCSI] osd: checking NULL instead of ERR_PTR()

bio_map_kern() returns ERR_PTRs on failure and never returns NULL.

[jejb: remove redundant unlikely spotted by Tobias Klauser]
Signed-off-by: NDan Carpenter <error27@gmail.com>
Acked-by: NBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

drivers/scsi/osd/osd_initiator.c

@@ -951,8 +951,8 @@ static int _osd_req_finalize_cdb_cont(struct osd_request *or, const u8 *cap_key)
 	/* create a bio for continuation segment */
 	bio = bio_map_kern(req_q, or->cdb_cont.buff, or->cdb_cont.total_bytes,
 			   GFP_KERNEL);
-	if (unlikely(!bio))
-		return -ENOMEM;
+	if (IS_ERR(bio))
+		return PTR_ERR(bio);
 
 	bio->bi_rw |= REQ_WRITE;