[Bug 728326] Check for return values of gst_buffer_map and gst_memory_map

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=728326
  GStreamer | gstreamer (core) | git

--- Comment #2 from Edward Hervey <bilboed at bilboed.com> 2014-04-16 09:46:13 UTC ---
Created an attachment (id=274438)
 View: https://bugzilla.gnome.org/attachment.cgi?id=274438
 Review: https://bugzilla.gnome.org/review?bug=728326&attachment=274438

plugins: Check return values of gst_buffer_map()

They can fail for various reasons.

For non-fatal cases (such as the dump feature of identiy and fakesink),
we just silently skip it.

For other cases post an error message.

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