[Bug 768718] videoscale: fix leak in test

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768718

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 331311
  --> https://bugzilla.gnome.org/attachment.cgi?id=331311&action=edit
videoscale: fix bus leak in test

gst_bus_add_signal_watch() takes a ref on the bus which should be
released using gst_bus_remove_signal_watch().

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