SEGV in xftaskbar4 3.90.0

[Benedikt Meurer]

> Hi,

Hey Matti,

> When disabling system tray, xftaskbar4 will segfault at startup in
> taskbar_toggle_tray when calling gtk_widget_destroy(...) with
> uninitialized taskbar->iconbox.
> This patch has fixed it for me.

Committed, thank you very much.

> --matti

Benedikt

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