Fix "unreachable code" warning.
Fix "unreachable code" warning.

* /subversion/libsvn_delta/compat.c
  (add_symlink_cb, alter_symlink_cb, rotate_cb): SVN__NOT_IMPLEMENTED
   does an unconditional return; so remove the trailing return SVN_NO_ERROR

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1349315 13f79535-47bb-0310-9956-ffa450edef68

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