[PATCH] Make sure update_super returns correct value.

[PATCH] Make sure update_super returns correct value.

For 'force' and 'assemble', update_super must return true
if anything was changed.

Also fix a bug with wonly handling in super0.

Signed-off-by: Neil Brown <neilb@suse.de>
### Diffstat output
 ./super0.c |   18 ++++++++++++++----
 ./super1.c |    7 +++++++
 2 files changed, 21 insertions(+), 4 deletions(-)

diff ./super0.c~current~ ./super0.c