On the fsfs-format7 branch: Fix a cache usage inefficiency when
svn_revision_t is only 32 bits.

* subversion/libsvn_fs_fs/cached_data.c
  (block_read): make sure the cache key is fully initialized

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1489955 13f79535-47bb-0310-9956-ffa450edef68