pcx: K&R formatting cosmetics
pcx: Do not overread source buffer in pcx_rle_decode

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
mlpdsp: x86: Respect cpuflags
mlpdec: Do not set invalid context in read_restart_header

The faulty values rippled further down the codepath causing a
hard-to-track segfault in the assembly code.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
vdpau: use the correct namespace for the union

Vdp is used by libvdpau, use AVVDPAU as used for the rest.

Reported-by: Alexis Ballier <aballier@gentoo.org>
pcm: always use codec->id instead of codec_id

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
dca: Error out on missing DSYNC

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
dca: Respect the current limits in the downmixing capabilities

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