try to use memset correctly

src/lib66/exec/ssexec_tree_admin.c

src/lib66/exec/ssexec_tree_signal.c

src/lib66/module/regex_replace.c

src/lib66/parse/parse_compute_list.c

src/lib66/parse/parse_rename_interdependences.c

src/lib66/service/service_graph_build.c

src/lib66/svc/svc_launch.c