On the log-addressing branch: Fix C89 compliance issue.

* subversion/libsvn_fs_fs/cached_data.c
  (block_read): declare variables at block start

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-addressing@1533818 13f79535-47bb-0310-9956-ffa450edef68