[Bug 765903] fix various leaks in tests

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765903

--- Comment #6 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 327151
  --> https://bugzilla.gnome.org/attachment.cgi?id=327151&action=edit
pipeline: fix bus leak in seek test

gst_bus_add_signal_watch_full() keeps a ref on the bus which should
be released using gst_bus_remove_signal_watch().

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