crypto: testmgr - add empty test vectors for null ciphers

Without these, kernel log shows:
[    5.984881] alg: No test for cipher_null (cipher_null-generic)
[    5.985096] alg: No test for ecb(cipher_null) (ecb-cipher_null)
[    5.985170] alg: No test for compress_null (compress_null-generic)
[    5.985297] alg: No test for digest_null (digest_null-generic)
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/testmgr.c

@@ -1912,6 +1912,9 @@ static const struct alg_test_desc alg_test_descs[] = {
 				}
 			}
 		}
+	}, {
+		.alg = "compress_null",
+		.test = alg_test_null,
 	}, {
 		.alg = "crc32c",
 		.test = alg_test_crc32c,
@@ -2126,6 +2129,9 @@ static const struct alg_test_desc alg_test_descs[] = {
 				}
 			}
 		}
+	}, {
+		.alg = "digest_null",
+		.test = alg_test_null,
 	}, {
 		.alg = "ecb(__aes-aesni)",
 		.test = alg_test_null,
@@ -2236,6 +2242,9 @@ static const struct alg_test_desc alg_test_descs[] = {
 				}
 			}
 		}
+	}, {
+		.alg = "ecb(cipher_null)",
+		.test = alg_test_null,
 	}, {
 		.alg = "ecb(des)",
 		.test = alg_test_skcipher,