volume meter widget causes crash

[Joël Krähemann <weedlight gmail com>]

Why do I get the following error:

**
Gdk:ERROR:/tmp/buildd/gtk
+2.0-2.24.10/gdk/gdkregion-generic.c:1110:miUnionNonO: assertion failed:
(y1 < y2)
Abgebrochen

please take a look at:
https://sourceforge.net/p/ags/code/HEAD/tree/src/ags/audio/recall/ags_peak_channel.c
https://sourceforge.net/p/ags/code/HEAD/tree/src/ags/widget/ags_vindicator.c