asfdemux: Fix payloads check

Don't iterate stream->payloads if ... it doesn't exist

CID #1139846
mpeg2dec: do not reset the whole video info when setting size

New changes to gstvideo will reset all the video info state
when calling _set_format, overwriting what was previously set
in the preceding code.

The comment says the following code is meant to preserve the
pre-crop size, so let's just keep the size and related data
 as this does not seem to break anything else (this is what
the _set_format call would have set before the change that
reset all data, except the colorimetry).
dvdread: avoid intermediate promotion to signed

We should not reach the dangerous range here, though.

Coverity 206491, 206492, 1139856
dvdsubdec: fix spurious rejection of 0 time offset commands

Coverity 206168
docs: remove outdated and pointless 'Last reviewed' lines from docs

They are very confusing for people, and more often than not
also just not very accurate. Seeing 'last reviewed: 2005' in
your docs is not very confidence-inspiring. Let's just remove
those comments.
Automatic update of common submodule

From bcb1518 to 211fa5f
po: Update translations
Update .po files
Release 1.3.1
Back to development
mpeg2dec: Release codec state on negotiation failures

Else it leaks

CID #1212169
rtspreal: Fix some memory leaks in an error path

CID 1212165.
mpeg2dec: remove unused struct members
Automatic update of common submodule

From 211fa5f to 1f5d3c3
Update .po files
Release 1.3.2
Back to development
asfdemux: Handle initial 0 timestamp that should have been -1

https://bugzilla.gnome.org/show_bug.cgi?id=719660
x264enc: fix caps leak in set_format()

https://bugzilla.gnome.org/show_bug.cgi?id=730865
asfdemux: use GstFlowCombiner

Removes flow return combination code to use the newly added GstFlowCombiner

https://bugzilla.gnome.org/show_bug.cgi?id=709224