[Bug 739941] gl: Correct invalid comment text

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739941
  GStreamer | gst-plugins-bad | git

--- Comment #4 from Hyunjun <zzoon.ko at samsung.com> 2014-11-12 00:22:33 UTC ---
I just removed unnecessary '+' character in the comments :-)

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