Address compiler warning seen within filemgr
Address compiler warning seen within filemgr

lag ' ' results in undefined behavior with 'u' conversion specifier

Change-Id: I0b2f3e83fb8416504f5cc27bdb44c6d62d69b51f
Reviewed-on: http://review.couchbase.org/65911
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

hisundar/forestdb,wurikiji/forestdb,couchbase/forestdb,couchbase/forestdb,hisundar/forestdb,wurikiji/forestdb