[SCSI] tgt: use KMEM_CACHE macro

This uses new KMEM_CACHE() macro instead of kmem_cache_create directly
to simplify slab cache creation.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index a0f308b..ee8496a 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -621,9 +621,7 @@
 {
 	int err;
 
-	scsi_tgt_cmd_cache = kmem_cache_create("scsi_tgt_cmd",
-					       sizeof(struct scsi_tgt_cmd),
-					       0, 0, NULL);
+	scsi_tgt_cmd_cache =  KMEM_CACHE(scsi_tgt_cmd, 0);
 	if (!scsi_tgt_cmd_cache)
 		return -ENOMEM;