On the 'moves-tracking-2' branch: Fix an uninitialized memory error.

* subversion/libsvn_delta/compat3.c
  (svn_delta__ev3_from_delta_for_commit): Don't leave the
    'ev1_root_dir_baton' field uninitialized in the edit baton.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/move-tracking-2@1622188 13f79535-47bb-0310-9956-ffa450edef68