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[libpng17] Handle zero-length PLTE chunk or NULL palette with png_error()

instead of png_chunk_report(), which by default issues a warning
rather than an error, leading to later reading from a NULL pointer
(png_ptr->palette) in png_do_expand_palette().

Glenn Randers-Pehrson Glenn Randers-Pehrson 2013-12-15

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changed pngrtran.c
changed pngset.c
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