lua: fix potential leak (and missing unlock).

modules/misc/lua/extension_thread.c

@@ -222,7 +222,12 @@ int PushCommand( extension_t *p_ext,
         case CMD_TRIGGERMENU:
             {
                 int *pi = malloc( sizeof( int ) );
-                if( !pi ) return VLC_ENOMEM;
+                if( !pi )
+                {
+                    free( cmd );
+                    vlc_mutex_unlock( &p_ext->p_sys->command_lock );
+                    return VLC_ENOMEM;
+                }
                 *pi = va_arg( args, int );
                 cmd->data[0] = pi;
             }

modules/misc/lua/libs/dialog.c

@@ -163,7 +163,10 @@ static int vlclua_dialog_create( lua_State *L )
     lua_getglobal( L, "vlc" );
     lua_getfield( L, -1, "__dialog" );
     if( lua_topointer( L, lua_gettop( L ) ) != NULL )
+    {
+        free( p_dlg );
         return luaL_error( L, "Only one dialog allowed per extension!" );
+    }
 
     p_dlg->p_object = p_this;
     p_dlg->psz_title = strdup( psz_title );