[Bug 739345] codecparsers: remove ignored increment of return

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739345
  GStreamer | gst-plugins-bad | git

--- Comment #6 from Luis de Bethencourt <luis.bg at samsung.com> 2014-10-29 15:10:41 UTC ---
Created an attachment (id=289595)
 View: https://bugzilla.gnome.org/attachment.cgi?id=289595
 Review: https://bugzilla.gnome.org/review?bug=739345&attachment=289595

Do the increment correctly and clean the code

The problem was that the code was adding 1 just before the only usage of
markersize.

> if (gst_bit_reader_get_bits_uint32_unchecked (&br, markersize + 1) != 0x01)

So to make this cleaner I brought the increment back, but as a pre-increment
and removed the + 1 in the above line.

Also, the variable markersize doesn't need to be stored in the GstMpeg4Packet
structure since the above is the only function block that uses it. So I removed
that and cleaned it.

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