vc1: Do not assume seek happens after decoding
If a seek is requested before the decoding start there is no current picture. CC: libav-stable@libav.org
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@ -5503,7 +5503,7 @@ static void vc1_sprite_flush(AVCodecContext *avctx)
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Since we can't enforce it, clear to black the missing sprite. This is
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wrong but it looks better than doing nothing. */
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if (f->data[0])
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if (f && f->data[0])
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for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)
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for (i = 0; i < v->sprite_height>>!!plane; i++)
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memset(f->data[plane] + i * f->linesize[plane],
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