[Bug 727746] Factor buffer flags-to-string code

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=727746
  GStreamer | gstreamer (core) | git

--- Comment #3 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-04-07 13:59:45 UTC ---
Created an attachment (id=273712)
 View: https://bugzilla.gnome.org/attachment.cgi?id=273712
 Review: https://bugzilla.gnome.org/review?bug=727746&attachment=273712

factor two other instances

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