Ticket #47623 fix memleak caused by 47347
https://fedorahosted.org/389/ticket/47623
Reviewed by: nhosoi (Thanks!)
Branch: 389-ds-base-1.2.11
Fix Description: Only need to create the mutex when creating a new PR object.
Platforms tested: RHEL6 x86_64
Flag Day: no
Doc impact: no
(cherry picked from commit 98ccb602058270e97a3702ae2b81c17635af8d27)
(cherry picked from commit 65c51555c0ecc94c5d93f09124168697ba1db6b3)
(cherry picked from commit 8a2c666df491b7c8666f8a70a5038b35c43fbc3b)
(cherry picked from commit 8968e078caacf1021a11c19546c448a4b65db098)