vos: fix vos release -verbose output

vos: fix vos release -verbose output

Fix incorrect vos release -verbose messages introduced by commit
9f4684cd5fac5eacf571b882e965150943383170.

The commit 9f4684cd5fac5eacf571b882e965150943383170 did not take into
account the change from commit 3fc800be9c702c1a40869908831a9895602909cb
in which a partial commit is performed when just new sites are added and
the read-write volume was not changed since the previous release.

Change-Id: If4b3ab81cd810df2e866d6eca0152f475c5448d6
Reviewed-on: https://gerrit.openafs.org/12455
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>