* #6893: fixes segfault in client on clean history

Caused by double free.

gnome/src/contacts/calllist.c

@@ -90,7 +90,7 @@ calllist_free_element(gpointer data, gpointer user_data UNUSED)
         free_conference_obj_t (element->elem.conf);
     else /* HIST_CALL */
         free_callable_obj_t (element->elem.call);
-    free (element);
+    g_free (element);
 }
 
 void
@@ -110,7 +110,7 @@ calllist_reset (calltab_t* tab)
 void calllist_add_history_call (callable_obj_t *obj)
 {
     if (eel_gconf_get_integer (HISTORY_ENABLED)) {
-        QueueElement *element = malloc(sizeof(QueueElement));
+        QueueElement *element = g_new0(QueueElement, 1);
         element->type = HIST_CALL;
         element->elem.call = obj;
         g_queue_push_tail (history->callQueue, (gpointer) element);
@@ -121,7 +121,7 @@ void calllist_add_history_call (callable_obj_t *obj)
 void calllist_add_history_conference(conference_obj_t *obj)
 {
     if(eel_gconf_get_integer (HISTORY_ENABLED)) {
-        QueueElement *element = malloc(sizeof(QueueElement));
+        QueueElement *element = g_new0(QueueElement, 1);
         element->type = HIST_CONFERENCE;
         element->elem.conf = obj;
         g_queue_push_tail (history->callQueue, (gpointer) element);
@@ -134,7 +134,7 @@ calllist_add_call (calltab_t* tab, callable_obj_t * c)
 {
     DEBUG("Calllist: Add Call %s", c->_callID);
 
-    QueueElement *element = malloc(sizeof(QueueElement));
+    QueueElement *element = g_new0(QueueElement, 1);
     element->type = HIST_CALL;
     element->elem.call = c;
     g_queue_push_tail(tab->callQueue, (gpointer) element);
@@ -146,14 +146,11 @@ calllist_clean_history (void)
     guint size = calllist_get_size (history);
     for (guint i = 0; i < size; i++) {
         QueueElement* c = calllist_get_nth(history, i);
-	if(c->type == HIST_CALL) {
+        if (c->type == HIST_CALL)
             calltree_remove_call (history, c->elem.call, NULL);
-        }
-	else if(c->type == HIST_CONFERENCE) {
+        else if(c->type == HIST_CONFERENCE)
             calltree_remove_conference (history, c->elem.conf, NULL);
     }
-    	free(c);
-    }
 
     calllist_reset (history);
 }