avcodec/pngdec: reset has_trns after every decode_frame_png()
Fixes #4887. Signed-off-by: Paul B Mahol <onemda@gmail.com> (cherry picked from commit 1d0487f77f07663c510207eb6e946675b71823cb)
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@ -1254,7 +1254,7 @@ static int decode_frame_png(AVCodecContext *avctx,
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return AVERROR_INVALIDDATA;
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}
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s->y = s->state = 0;
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s->y = s->state = s->has_trns = 0;
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/* init the zlib */
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s->zstream.zalloc = ff_png_zalloc;
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