[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 #4 from Edward Hervey <bilboed at bilboed.com> 2014-04-16 09:46:21 UTC ---
Created an attachment (id=274440)
 View: https://bugzilla.gnome.org/attachment.cgi?id=274440
 Review: https://bugzilla.gnome.org/review?bug=728326&attachment=274440

manual: Fix examples to check for gst_buffer_map return values

Otherwise people reading the manual will expect it to always
succeed :)

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