ubik: Avoid use of freed string

If cellName was just set to dir->cellName, afsconf_Close() will
free the string before fprintf uses it.  Just change the order
so we don't access freed memory and print garbage.

Change-Id: I66792dc50addf2d8242f71923db09fcc178cc450
Reviewed-on: http://gerrit.openafs.org/9886
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>