Check that end_of_seq() [EOSEQ] and end_of_stream [EOS] NAL units
are correctly parsed and the reported NAL unit size yields 1 byte,
i.e. the only NalHeaderBytes in there.
https://bugzilla.gnome.org/show_bug.cgi?id=732553
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>