snow: zero scratchbuf.
This should fix some valgrind warnings. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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		@@ -446,7 +446,7 @@ av_cold int ff_snow_common_init(AVCodecContext *avctx){
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            ff_scale_mv_ref[i][j] = 256*(i+1)/(j+1);
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    s->avctx->get_buffer(s->avctx, &s->mconly_picture);
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    s->scratchbuf = av_malloc(s->mconly_picture.linesize[0]*7*MB_SIZE);
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    s->scratchbuf = av_mallocz(s->mconly_picture.linesize[0]*7*MB_SIZE);
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    return 0;
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}
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