[Bug 797366] tests: need to check return when using gst_buffer_map.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797366

--- Comment #1 from Fei <fei.w.wang at intel.com> ---
Created attachment 374132
  --> https://bugzilla.gnome.org/attachment.cgi?id=374132&action=edit
patch

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