tests: fix compilation error in sign_tests.c

src/tests/libknot/sign_tests.c

@@ -238,7 +238,9 @@ static int sign_tests_run(int argc, char *argv[])
 		   "knot_tsig_key_from_params(), no shared secret");
 
 		params.name = name;
-		params.secret = "Ok6NmA==";
+		result = knot_binary_from_base64("Ok6NmA==", &params.secret);
+		assert(result == KNOT_EOK);
+
 		uint8_t decoded_secret[] = { 0x3a, 0x4e, 0x8d, 0x98 };
 		result = knot_tsig_key_from_params(&params, &tsig_key);
 		ok(result == KNOT_EOK