tree-wide: replace cg_get_path_and_check() with cg_get_path()

We have dropped cgroup v1 support in v258. When running on cgroup v2,
cg_get_path_and_check() with SYSTEMD_CGROUP_CONTROLLER as controller is
equivalent with checking if we are running on cgroup v2 and then
cg_get_path(). As we can assume we are running on cgroup v2, then the
check is not necessary anymore, thus we can replace
cg_get_path_and_check() with cg_get_path().

src/basic/process-util.c

@@ -2146,11 +2146,7 @@ int posix_spawn_wrapper(
         if (cgroup && have_clone_into_cgroup) {
                 _cleanup_free_ char *resolved_cgroup = NULL;
 
-                r = cg_get_path_and_check(
-                                SYSTEMD_CGROUP_CONTROLLER,
-                                cgroup,
-                                /* suffix= */ NULL,
-                                &resolved_cgroup);
+                r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, cgroup, /* suffix= */ NULL, &resolved_cgroup);
                 if (r < 0)
                         return r;