tools/testing/crypto: Use vzalloc instead of vmalloc+memset

This fixes the corresponding coccinelle warning.
Signed-off-by: Siddh Raman Pant <code@siddh.me>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Link: https://lore.kernel.org/r/20220627075148.140705-1-code@siddh.me
[agordeev@linux.ibm.com added Link]
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

tools/testing/crypto/chacha20-s390/test-cipher.c

@@ -252,29 +252,26 @@ static int __init chacha_s390_test_init(void)
 	memset(plain, 'a', data_size);
 	get_random_bytes(plain, (data_size > 256 ? 256 : data_size));
 
-	cipher_generic = vmalloc(data_size);
+	cipher_generic = vzalloc(data_size);
 	if (!cipher_generic) {
 		pr_info("could not allocate cipher_generic buffer\n");
 		ret = -2;
 		goto out;
 	}
-	memset(cipher_generic, 0, data_size);
 
-	cipher_s390 = vmalloc(data_size);
+	cipher_s390 = vzalloc(data_size);
 	if (!cipher_s390) {
 		pr_info("could not allocate cipher_s390 buffer\n");
 		ret = -2;
 		goto out;
 	}
-	memset(cipher_s390, 0, data_size);
 
-	revert = vmalloc(data_size);
+	revert = vzalloc(data_size);
 	if (!revert) {
 		pr_info("could not allocate revert buffer\n");
 		ret = -2;
 		goto out;
 	}
-	memset(revert, 0, data_size);
 
 	if (debug)
 		print_hex_dump(KERN_INFO, "src: ", DUMP_PREFIX_OFFSET,