Follow-up to r1696171: Fix FSFS breakage.
Follow-up to r1696171: Fix FSFS breakage.

* subversion/libsvn_fs_fs/id.c
  (svn_fs_fs__id_serialize): This is a case where actual data size and
                             and interface type size don't match up.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1696185 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion