fsck.gfs2: Adjust when hash table is doubled
    
    If directory entries are found to be on the wrong leaf block, they are
    moved as needed. That sometimes requires the leaf block to be split,
    which, in turn, sometimes requires the hash table be doubled. The
    problem was that the functions that traverse the hash tables were
    not taking into account the fact that the hash table could just
    unexpectly double, throwing off all the pointers. This patch attempts
    to correct that by fixing up the pointers as necessary.