gfs2_convert: Conversion of inodes that are of different metatree heights in gfs and gfs2 is incorrect
    
    Resolves bz 548588 - The first hunk of the patch fixes a possible typo
    where the gfs1 height was being used instead of gfs2 height to compute
     the fan-out factors. When both heights at gfs1 and gfs2 are the same,
    this really doesn't matter, but at different heights, I get a floating
    point exception and gfs2_convert crashes.
    
    The second part of the fix has to do with updating the height
    information of a given block after it's revised metapath is computed
    according to gfs2 parameters. Without this line, gfs2_convert was using
    the same height as that of gfs1 for the converted file and weird blocks
    were included in the file's data and metadata, thereby corrupting it.