avcodec/dvdsubdec: ignore h <= 1 case, to properly decode subtitle
Fixes #5825. If h == 1, second decode_rle() fails. Regression since: 3f0a3e9e. Signed-off-by: NPaul B Mahol <onemda@gmail.com>
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Fixes #5825. If h == 1, second decode_rle() fails. Regression since: 3f0a3e9e. Signed-off-by: NPaul B Mahol <onemda@gmail.com>