Fixes reading uninitialized memory
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 530eb6ac)

Conflicts:

	libavformat/hlsenc.c
(cherry picked from commit 0ac22f043bee2f1c4daf5e1044b014326325d929)

Conflicts:

	libavformat/hlsenc.c
(cherry picked from commit 134d3e1c0331462ea94c78a5e13a63b20d283653)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>