demux: ogg: check packets header size (fix #13875)
demux: ogg: check packets header size (fix #13875)

(cherry picked from commit 0b37fc45954b2da51e452bb7111f32fa61d8edc5)
Signed-off-by: Jean-Baptiste Kempf <7b85a41a628204b76aba4326273a3ccc74bd009a@videolan.org>

jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2