core/cgroup: also assume cgroup.events frozen attr is available

Follow-up for 3c86a935ad2f88a83f1f465544cb0c8bdc288f4c

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 2050494a859f23acd0a6e3ddc1ad70fd4ecad7cf..504a64d231fb39959517e9db04bd865975d8e488 100644 (file)
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -3176,7 +3176,7 @@ static int unit_check_cgroup_events(Unit *u) {
         if (!crt || !crt->cgroup_path)
                 return 0;
 
-        r = cg_get_keyed_attribute_graceful(
+        r = cg_get_keyed_attribute(
                         SYSTEMD_CGROUP_CONTROLLER,
                         crt->cgroup_path,
                         "cgroup.events",
@@ -3188,22 +3188,18 @@ static int unit_check_cgroup_events(Unit *u) {
         /* The cgroup.events notifications can be merged together so act as we saw the given state for the
          * first time. The functions we call to handle given state are idempotent, which makes them
          * effectively remember the previous state. */
-        if (values[0]) {
-                if (streq(values[0], "1"))
-                        unit_remove_from_cgroup_empty_queue(u);
-                else
-                        unit_add_to_cgroup_empty_queue(u);
-        }
+        if (streq(values[0], "1"))
+                unit_remove_from_cgroup_empty_queue(u);
+        else
+                unit_add_to_cgroup_empty_queue(u);
 
         /* Disregard freezer state changes due to operations not initiated by us.
          * See: https://github.com/systemd/systemd/pull/13512/files#r416469963 and
          *      https://github.com/systemd/systemd/pull/13512#issuecomment-573007207 */
-        if (values[1] && IN_SET(u->freezer_state, FREEZER_FREEZING, FREEZER_FREEZING_BY_PARENT, FREEZER_THAWING))
+        if (IN_SET(u->freezer_state, FREEZER_FREEZING, FREEZER_FREEZING_BY_PARENT, FREEZER_THAWING))
                 unit_freezer_complete(u, streq(values[1], "0") ? FREEZER_RUNNING : FREEZER_FROZEN);
 
-        free(values[0]);
-        free(values[1]);
-
+        free_many_charp(values, ELEMENTSOF(values));
         return 0;
 }