dm integrity: use kzalloc() instead of kmalloc() + memset()

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-integrity.c

@@ -3360,7 +3360,7 @@ static int create_journal(struct dm_integrity_c *ic, char **error)
 				goto bad;
 			}
 
-			crypt_iv = kmalloc(ivsize, GFP_KERNEL);
+			crypt_iv = kzalloc(ivsize, GFP_KERNEL);
 			if (!crypt_iv) {
 				*error = "Could not allocate iv";
 				r = -ENOMEM;
@@ -3389,7 +3389,6 @@ static int create_journal(struct dm_integrity_c *ic, char **error)
 				sg_set_buf(&sg[i], va, PAGE_SIZE);
 			}
 			sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
-			memset(crypt_iv, 0x00, ivsize);
 
 			skcipher_request_set_crypt(req, sg, sg,
 						   PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);