Update src/systray/systraybar.c

https://pastebin.com/UxDTv4ML

src/systray/systraybar.c

@@ -292,9 +292,10 @@ void on_change_systray(void *obj)
     }
 
     TrayWindow *traywin;
-    GSList *l;
+    GSList *l, *next;
     int i;
-    for (i = 1, l = systray.list_icons; l; i++, l = l->next) {
+    for (i = 1, l = systray.list_icons; l; i++, l = next) {
+        next = l->next;
         traywin = (TrayWindow *)l->data;
 
         traywin->y = posy;