lavr: fix missing " in header documentation

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
avprobe: also output dar/par if only defined in stream

Based on a patch by Jan Gerber <j@v2v.cc>
Update release notes for the 9 release.

Add a paragraph about MSVC and mention 24-bit FLAC encoding.
Prepare for 9 Release.
finalize changelog for version 9
mxfdec: fix NULL checking in mxf_get_sorted_table_segments()

The following out-of-memory check is broken.

    *sorted_segments  = av_mallocz(...);
    if (!sorted_segments) { ... }

The correct NULL check should use *sorted_segments.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
swscale: fix NULL checking in sws_alloc_context()

sws_getCachedContext() and sws_getContext() expect sws_alloc_context()
to return NULL when out of memory, as follows.

    if (!(context = sws_alloc_context()))
        return NULL;

This patch fixes sws_alloc_context() to return NULL in that case.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
x86: lavr: use the x86inc.asm automatic stack alignment in mixing functions

CC:libav-stable@libav.org
4xm: return meaningful error codes
4xm: simplify code with FFSWAP
4xm: eliminate a pointless indirection
4xm: operate with pointers to AVFrames instead of whole structs.

This is more correct and avoids breaking extended_data.
8bps: return meaningful error codes.
aasc: return meaningful error codes.
anm: return meaningful error codes
ansi: return a meaningful error code
asvdec: return meaningful error codes.
aura: return meaningful error codes.
avs: return meaningful error codes.
bethsoftvideo: return meaningful error codes.