avcodec/mss2: Fix integer overflow
This also simplifies the code
Fixes: signal_sigabrt_7ffff6ac8cc9_2943_cov_3588637614_mss2_speech.wmv
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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