[Bug 765961] Fix element leak in gstutils.c:find_common_root()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765961

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 327271
  --> https://bugzilla.gnome.org/attachment.cgi?id=327271&action=edit
utils: fix element leak in find_common_root()

The root element was not unreffed when iterating over ancestors.

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