a64multienc: don't write into output buffer when there's no output.
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@ -317,8 +317,6 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
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charset += charset_size;
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req_size += charset_size;
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}
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/* no charset so clean buf */
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else memset(buf, 0, charset_size);
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/* write x frames to buf */
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for (frame = 0; frame < c->mc_lifetime; frame++) {
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