gfs2_convert: mark buffer dirty when switching dirs from meta to data
    
    This patch changes function inode_renumber so that it properly marks
    the rgrp bitmap dirty after switching bits from "meta" to "data".
    This happens when directory leaf, hash table, eattr, etc. blocks come
    in from GFS1 as "meta" and need to be switched to GFS2 as "data".
    In GFS2, only dinodes get the "meta" designation. This conversion was
    taking place, but the code broke out of the loop before properly
    marking the buffer as modified. So if no other modifications were
    done to that bitmap, the bitmap change would be forgotten.
    
    rhbz#887374