af_channelmap: fix ONE_STR mapping mode
get_channel() returns 0 on success CC:libav-stable@libav.org (cherry picked from commit e843612695007cc623813073754c651ab43021f7)
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@ -188,7 +188,7 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
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s->map[i].out_channel_idx = i;
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break;
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case MAP_ONE_STR:
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if (!get_channel(&mapping, &in_ch, separator)) {
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if (get_channel(&mapping, &in_ch, separator) < 0) {
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av_log(ctx, AV_LOG_ERROR, err);
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return AVERROR(EINVAL);
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}
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