demux: mp4: fix heap buffer ofw with zero chunk (fix #12356)
demux: mp4: fix heap buffer ofw with zero chunk (fix #12356)

(cherry picked from commit 929970aecfc91725ba243953ccb5197fa797c0a8)
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