qt4_skins2: fix a crash that occure when using skins2.

modules/gui/qt4/dialogs_provider.hpp

@@ -203,7 +203,7 @@ public:
         i_arg = _i_arg;
         p_arg = _p_arg;
     };
-    virtual ~DialogEvent() { delete p_arg; };
+    virtual ~DialogEvent() { };
 
     int i_arg, i_dialog;
     intf_dialog_args_t *p_arg;

modules/gui/qt4/main_interface.cpp

@@ -1123,7 +1123,7 @@ static int PopupMenuCB( vlc_object_t *p_this, const char *psz_variable,
     if( p_intf->pf_show_dialog )
     {
         p_intf->pf_show_dialog( p_intf, INTF_DIALOG_POPUPMENU,
-                                new_val.b_bool, 0 );
+                                new_val.b_bool, NULL );
     }
 
     return VLC_SUCCESS;