avcodec/hnm4video: check that packetsize is at least 8
Fixes integer overflow and assertion failure
Fixes: signal_sigabrt_7ffff7126425_1243_CASSE.HNM
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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