Issue 49158 - fix latest coverity issues
14094 - dereference after null check in cl_cache.c
13685 - dereference before null check in cb_search.c
13680 - Explicit null dereferenced in memberof.c
13682 - Bad use of null-like value in ticket48005_test.py
https://pagure.io/389-ds-base/issue/49158
Reviewed by: nhosoi & firstyear (Thanks!!)
(cherry picked from commit f77e77779aea54bc0fe068974e1dd130ea7e1891)