On the fsfs-format7 branch: Fix memory corruption caused by array element
type mismatches.

* subversion/libsvn_fs_fs/index.c
  (svn_fs_fs__l2p_index_create,
   svn_fs_fs__serialize_l2p_page): sub-items use a different type than offsets

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1463121 13f79535-47bb-0310-9956-ffa450edef68