test-networkd-conf: config_parse_ether_addrs() uses ether_addr_hash_ops_free

Hence, set_free() is enough to free the result.

src/network/test-networkd-conf.c

@@ -58,7 +58,7 @@ static void test_config_parse_ether_addr_one(const char *rvalue, const struct et
 }
 
 static void test_config_parse_ether_addrs_one(const char *rvalue, const struct ether_addr* list, size_t n) {
-        _cleanup_set_free_free_ Set *s = NULL;
+        _cleanup_set_free_ Set *s = NULL;
 
         ASSERT_OK(config_parse_ether_addrs("network", "filename", 1, "section", 1, "lvalue", 0, rvalue, &s, NULL));
         ASSERT_EQ(set_size(s), n);