Bug 722292 - (cov#11030) Leak of mapped_sdn in winsync rename code
The previous fix for bug 722292 introduced a memory leak of the
mapped DN used to detect entry renames. This ensures that we
free the mapped DN.
Branch: 389-ds-base-1.2.9
(cherry picked from commit 576d90b25524b06dad4b5497fc6f7e5e673c8899)