avformat/nutdec: Check ff_gen_search() for failure
Fixes assertion failure Found-by: durandal_1707 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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		@@ -1280,6 +1280,8 @@ static int read_seek(AVFormatContext *s, int stream_index,
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                            next_node[1]->pos, next_node[1]->pos,
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					                            next_node[1]->pos, next_node[1]->pos,
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                            next_node[0]->ts, next_node[1]->ts,
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					                            next_node[0]->ts, next_node[1]->ts,
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                            AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
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					                            AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
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					        if (pos < 0)
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					            return pos;
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        if (!(flags & AVSEEK_FLAG_BACKWARD)) {
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					        if (!(flags & AVSEEK_FLAG_BACKWARD)) {
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            dummy.pos    = pos + 16;
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					            dummy.pos    = pos + 16;
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