Quote parameter of ldap.memberof #775

Job	Run time
pre-ci	7s
master-gh-ubuntu20-linux-gcc-lean	6m 18s
master-gh-ubuntu20-linux-gcc	6m 40s
master-gh-ubuntu20-linux-gcc-O2-g3	6m 31s
master-gh-ubuntu20-linux-gcc-ndebug	5m 50s
master-gh-ubuntu20-linux-clang-lean	13m 7s
master-gh-ubuntu20-linux-clang	13m 30s
master-gh-ubuntu20-linux-clang-O2-g3	13m 14s
master-gh-ubuntu20-linux-clang-ndebug	12m 38s
master-gh-ubuntu20-linux-clang-altlibs	13m 26s
master-gh-ubuntu20-linux-fuzzer	26m 36s
Merge preflight	0s
Merge into upstream	0s
	1h 57m 57s

Provide feedback