[Bug 727889] mxf: avoid dereferencing NULL pointer and leak fixes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=727889
  GStreamer | gst-plugins-bad | git

Edward Hervey <bilboed> changed:

           What    |Removed                     |Added
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 Attachment #273885|none                        |committed
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