Don't mix stack and heap based allocations

freeing stack pointers is asking for big trouble

sflphone-client-gnome/src/dbus/dbus.c

@@ -1435,7 +1435,7 @@ gchar*
 dbus_get_current_audio_codec_name (const callable_obj_t * c)
 {
 
-    gchar* codecName = "";
+    gchar* codecName;
     GError* error = NULL;
 
     org_sflphone_SFLphone_CallManager_get_current_audio_codec_name (callManagerProxy,
@@ -1443,6 +1443,7 @@ dbus_get_current_audio_codec_name (const callable_obj_t * c)
 
     if (error) {
         g_error_free (error);
+        codecName = g_strdup("");
     }
 
     DEBUG ("%s: codecName : %s", __PRETTY_FUNCTION__, codecName);
@@ -1652,7 +1653,7 @@ dbus_get_audio_device_index (const gchar *name)
 gchar*
 dbus_get_current_audio_output_plugin()
 {
-    gchar* plugin = "";
+    gchar* plugin;
     GError* error = NULL;
     org_sflphone_SFLphone_ConfigurationManager_get_current_audio_output_plugin (
         configurationManagerProxy, &plugin, &error);
@@ -1660,6 +1661,7 @@ dbus_get_current_audio_output_plugin()
     if (error) {
         ERROR ("Failed to call get_current_audio_output_plugin() on ConfigurationManager: %s", error->message);
         g_error_free (error);
+        plugin = g_strdup("");
     }
 
     return plugin;
@@ -1672,13 +1674,14 @@ dbus_get_current_audio_output_plugin()
 gchar*
 dbus_get_noise_suppress_state()
 {
-    gchar* state = "";
+    gchar* state;
     GError* error = NULL;
     org_sflphone_SFLphone_ConfigurationManager_get_noise_suppress_state (configurationManagerProxy, &state, &error);
 
     if (error) {
         ERROR ("DBus: Failed to call get_noise_suppress_state() on ConfigurationManager: %s", error->message);
         g_error_free (error);
+        state = g_strdup("");
     }
 
     return state;
@@ -1704,12 +1707,13 @@ gchar *
 dbus_get_echo_cancel_state(void)
 {
     GError *error = NULL;
-    gchar *state = "";
+    gchar *state;
     org_sflphone_SFLphone_ConfigurationManager_get_echo_cancel_state(configurationManagerProxy, &state, &error);
 
     if(error) {
         ERROR("DBus: Failed to call get_echo_cancel_state() on ConfigurationManager: %s", error->message);
         g_error_free(error);
+        state = g_strdup("");
     }
 
     return state;