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.
(cherry picked from commit 93f079a9eea2472e9481bfd482a624f980e17c9a)
(cherry picked from ds-replication-RHEL-6 branch)