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

[GStreamer (bugzilla.gnome.org)]

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

           Summary: Factor buffer flags-to-string code
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


While fixing a strcpy-to-fixed-size-buffer issue found by Coverity, I saw the
code that had this was present in three different files. I factored this in
gstbuffer.c, but this may warrant comments about the API addition so I'll put
it here first. First two patches are what I'd also do to the other two
instances of that code should the third patch be NAKed.

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