gfs2_edit savemeta: Don't release indirect buffers too soon
    
    This patch fixes a regression in the "gfs2_edit savemeta" command
    whereby system files such as journals were not being saved.
    The function that processes indirect block lists was releasing
    buffers in a fashion that works okay with the old buf.c
    assumptions but too soon for the new buf.c assumptions.
    
    rhbz#455300