[Mp4-tech] [H.264] Possible FMO bug in JM?

[Alejandro Moya Molina]

Hi, everyone!
Maybe this is one of my typical "lapsus", which I have after braimstorming myself for days with some possible answer to my doubt, but I need you to make it clear to me.
In line 522 of "fmo.c" in JM versions 9.3 and 10.1 I read these lines: 
      if( k++ < sizeOfUpperLeftGroup )
        MapUnitToSliceGroupMap[ i * img->PicWidthInMbs + j ] = 1 - pps->slice_group_change_direction_flag;
      else
        MapUnitToSliceGroupMap[ i * img->PicWidthInMbs + j ] = pps->slice_group_change_direction_flag;
which belong to "FmoGenerateType5MapUnitMap" function. Then, if you take the standard in page 88/89, you may read this:
    if( k++ < sizeOfUpperLeftGroup )
      mapUnitToSliceGroupMap[ i * PicWidthInMbs + j ] = slice_group_change_direction_flag
    else 
      mapUnitToSliceGroupMap[ i * PicWidthInMbs + j ] = 1 - slice_group_change_direction_flag
which might seem the same at a first glance but they aren't: the condition is the same but the if-else order is reversed.
Would you mind being so kind to explain this, please? I analysed some stream coded with JM 9.3 using more than one Slice Group and I noticed that the coder executes the same bad code below to encode the map.
Thank you very much in advance and have you all a MERRY CHRISTMAS AND A HAPPY NEW YEAR!!!
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