oggparseogm: Convert to use bytestream2

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 19b9659f3174599e8685d329c4330b1ea8c4c6db)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>