On the fsfs-format7 branch: make sure that we use fully initialized
data structures.

* subversion/libsvn_fs_fs/cached_data.c
  (create_rep_state_body): clean upon allocation because we might not
                           assign all members

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1490958 13f79535-47bb-0310-9956-ffa450edef68