On the cache-server branch: remove some debug code

* subversion/libsvn_subr/cache-membuffer.c
  (find_entry): we don't need the printf() output anymore

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/cache-server@1476565 13f79535-47bb-0310-9956-ffa450edef68