crypto: marvell - Use kzfree rather than its implementation

Use kzfree instead of memset() + kfree().

Signed-off-by: zhong jiang <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/marvell/hash.c

···
 		}
 
 		/* Set the memory region to 0 to avoid any leak. */
-		memset(keydup, 0, keylen);
-		kfree(keydup);
+		kzfree(keydup);
 
 		if (ret)
 			return ret;