mszh: yuv420 compressed file fails to decode when width is not multiple of 4

[ami_stuff]

attached 306x306 files decodes visually correctly with VirtualDub + original VFW, but in this case the output from VirtualDub "Export/Raw video..." is not identical for both of the files

the same story about attached two 304x306 samples, which decodes visually ok with FFmpeg/VirtualDub, but the raw output is not identical for both of them

./ffmpeg -i mszh_306_306_yuv420.avi -y out.avi
ffmpeg version N-109867-g5247dab6b1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: 
  libavutil      58.  1.100 / 58.  1.100
  libavcodec     60.  2.100 / 60.  2.100
  libavformat    60.  2.100 / 60.  2.100
  libavdevice    60.  0.100 / 60.  0.100
  libavfilter     9.  1.100 /  9.  1.100
  libswscale      7.  0.100 /  7.  0.100
  libswresample   4.  9.100 /  4.  9.100
Input #0, avi, from 'mszh_306_306_yuv420.avi':
  Metadata:
    software        : Lavf60.2.100
  Duration: 00:00:00.33, start: 0.000000, bitrate: 27166 kb/s
  Stream #0:0: Video: mszh (MSZH / 0x485A534D), yuv420p, 306x306, 23.97 fps, 23.97 tbr, 23.97 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (mszh (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[mszh @ 0x55df7e4309c0] Decoded size differs (140454 != 140452)
[mszh @ 0x55df7e454180] Decoded size differs (140454 != 140452)
[mszh @ 0x55df7e477940] Decoded size differs (140454 != 140452)
Error while decoding stream #0:0: Invalid data found when processing input
    Last message repeated 2 times
[mszh @ 0x55df7e49b100] Decoded size differs (140454 != 140452)
Error while decoding stream #0:0: Invalid data found when processing input
[mszh @ 0x55df7e4be8c0] Decoded size differs (140454 != 140452)
Error while decoding stream #0:0: Invalid data found when processing input
[mszh @ 0x55df7e4e2080] Decoded size differs (140454 != 140452)
Error while decoding stream #0:0: Invalid data found when processing input
[mszh @ 0x55df7e505840] Decoded size differs (140454 != 140452)
Error while decoding stream #0:0: Invalid data found when processing input
[mszh @ 0x55df7e529000] Decoded size differs (140454 != 140452)
Error while decoding stream #0:0: Invalid data found when processing input
Output #0, avi, to 'out.avi':
  Metadata:
    software        : Lavf60.2.100
    ISFT            : Lavf60.2.100
  Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 306x306, q=2-31, 200 kb/s, 23.97 fps, 23.97 tbn
    Metadata:
      encoder         : Lavc60.2.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbframe=    0 fps=0.0 q=0.0 Lsize=       6kB time=-577014:32:22.77 bitrate=N/A speed=N/A    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
Conversion failed!

[Elon Musk]

No longer gives 0 output frames.

[ami_stuff]

fixed in 4ea28554db5195a3981822f88e55262ed0429411