Michael Niedermayer ac8ef33f9a avcodec/h264_slice: ignore SAR changes in slices after the first
Fixes race condition and null pointer dereference
Fixes: signal_sigsegv_1472ac3_468_cov_2915641226_CABACI3_Sony_B.jsv

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 38d5241b7f)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Conflicts:

	libavcodec/h264_slice.c
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