doc: Point to the correct, actually maintained gas-preprocessor repo

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit d15c536123a44362ace6299c391a492c90b83fc7)
Signed-off-by: Martin Storsjö <martin@martin.st>
h264: check buffer size before accessing it

Fixes invalid reads.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264_refs: make sure not to write over the bounds of the default ref list

Fixes invalid writes.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: reset data_partitioning if decoding the slice header for NAL_DPA fails

If it was set before then we can end up trying to decode a slice without
a valid slice header, which can lead to invalid memory access.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
(cherry picked from commit 58312b2472d3a44d7458865c459d59ef2e02bf1a)
h264: do not use 422 functions for monochrome

Fixes invalid memory access.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org