avcodec/pngdec: Only allow one IHDR chunk
Multiple IHDR chunks are forbidden in PNG Fixes inconsistency and out of array accesses Fixes: asan_heap-oob_4d5c5a_1738_cov_2638287726_c-m2-8f2b481b7fd9bd745e620b7c01a18df2.png Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by:Michael Niedermayer <michaelni@gmx.at> (cherry picked from commit 47f4e2d8) Conflicts: libavcodec/pngdec.c
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