afsd: Avoid printing cacheBaseDir for memcache

afsd: Avoid printing cacheBaseDir for memcache

cacheBaseDir is NULL when memcache is turned on; don't print it.

Reviewed-on: http://gerrit.openafs.org/7443
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 9eb924f16c6f3bb06d83ed281317f2ba29473202)

Change-Id: Ie5dce3a3ae12b2725c90475cd3f6718f9df63134
Reviewed-on: http://gerrit.openafs.org/7500
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>