avcodec/pngdec: Fix alpha detection with skip_frame
Fixes Ticket4816 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -1136,6 +1136,7 @@ static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
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case MKTAG('p', 'H', 'Y', 's'):
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case MKTAG('t', 'E', 'X', 't'):
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case MKTAG('I', 'D', 'A', 'T'):
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case MKTAG('t', 'R', 'N', 'S'):
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break;
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default:
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goto skip_tag;
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