Fix: add g_free after g_variant_get.

Add g_free() for newly-allocated copy of the string after
g_variant_get().

alterator_manager_default_interfaces.c

@@ -37,7 +37,7 @@ static void method_get_objects(GVariant *parameters,
     GHashTable *interfaces;
     gchar *node_name;
     gchar *interface_name;
-    gchar *param;
+    gchar *param = NULL;
     gchar *object_path;
 
     builder = g_variant_builder_new (G_VARIANT_TYPE ("ao"));
@@ -68,6 +68,9 @@ static void method_get_objects(GVariant *parameters,
                                           g_variant_new("(ao)", builder));
 
     g_variant_builder_unref (builder);
+    if (param != NULL) {
+        g_free(param);
+    }
 }
 
 static void method_get_signals(GVariant *parameters,
@@ -86,8 +89,8 @@ static void method_get_signals(GVariant *parameters,
     gchar *method_name;
     gchar *attr_name;
     gchar *attr_val;
-    gchar *interface_param;
-    gchar *method_param;
+    gchar *interface_param = NULL;
+    gchar *method_param = NULL;
 
     builder = g_variant_builder_new (G_VARIANT_TYPE ("as"));
     g_variant_get (parameters, "(&s&s)", &interface_param, &method_param);
@@ -137,6 +140,12 @@ static void method_get_signals(GVariant *parameters,
                                           g_variant_new("(as)", builder));
 
     g_variant_builder_unref (builder);
+    if (interface_param != NULL) {
+        g_free(interface_param);
+    }
+    if (method_param != NULL) {
+        g_free(method_param);
+    }
 }
 
 static void method_get_interfaces(GVariant *parameters,
@@ -144,7 +153,7 @@ static void method_get_interfaces(GVariant *parameters,
 {
     GVariantBuilder *builder;
     GHashTable *interfaces = NULL;
-    gchar *param;
+    gchar *param = NULL;
     gchar *node_name;
 
     builder = g_variant_builder_new (G_VARIANT_TYPE ("as"));
@@ -170,6 +179,9 @@ static void method_get_interfaces(GVariant *parameters,
                                           g_variant_new("(as)", builder));
 
     g_variant_builder_unref (builder);
+    if (param != NULL) {
+        g_free(param);
+    }
 }
 
 static gboolean authorization_check(GDBusMethodInvocation *invocation,