avcodec/dvdsub_parser: never return 0 when the input isnt 0
Fixes a infinite loop
Fixes Ticket3804
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit cfdb30d2f1)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
			
			
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		@@ -46,7 +46,7 @@ static int dvdsub_parse(AVCodecParserContext *s,
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    if (pc->packet_index == 0) {
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        if (buf_size < 2)
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            return 0;
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            return buf_size;
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        pc->packet_len = AV_RB16(buf);
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        if (pc->packet_len == 0) /* HD-DVD subpicture packet */
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            pc->packet_len = AV_RB32(buf+2);
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