Fix various compiler warnings when built without systemd.

Submitted upstream at <https://www.redhat.com/archives/dm-devel/2020-May/thread.html>.

diff --git a/libmultipath/config.c b/libmultipath/config.c
--- a/libmultipath/config.c
+++ b/libmultipath/config.c
@@ -696,7 +696,7 @@ process_config_dir(struct config *conf, char *dir)
 	pthread_cleanup_pop(1);
 }
 
-static void set_max_checkint_from_watchdog(struct config *conf)
+static void set_max_checkint_from_watchdog(__attribute__((unused)) struct config *conf)
 {
 #ifdef USE_SYSTEMD
 	char *envp = getenv("WATCHDOG_USEC");
diff --git a/multipathd/main.c b/multipathd/main.c
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -176,6 +176,7 @@ daemon_status(void)
 /*
  * I love you too, systemd ...
  */
+#ifdef USE_SYSTEMD
 static const char *
 sd_notify_status(enum daemon_status state)
 {
@@ -195,7 +196,6 @@ sd_notify_status(enum daemon_status state)
 	return NULL;
 }
 
-#ifdef USE_SYSTEMD
 static void do_sd_notify(enum daemon_status old_state,
 			 enum daemon_status new_state)
 {
@@ -247,7 +247,9 @@ enum daemon_status wait_for_state_change_if(enum daemon_status oldstate,
 static void __post_config_state(enum daemon_status state)
 {
 	if (state != running_state && running_state != DAEMON_SHUTDOWN) {
-		enum daemon_status old_state = running_state;
+		/* save state for sd_notify */
+		enum daemon_status
+			__attribute__((unused)) old_state = running_state;
 
 		running_state = state;
 		pthread_cond_broadcast(&config_cond);
@@ -272,7 +274,9 @@ int set_config_state(enum daemon_status state)
 	pthread_cleanup_push(config_cleanup, NULL);
 	pthread_mutex_lock(&config_lock);
 	if (running_state != state) {
-		enum daemon_status old_state = running_state;
+		/* save state for sd_notify */
+		enum daemon_status
+			__attribute__((unused)) old_state = running_state;
 
 		if (running_state == DAEMON_SHUTDOWN)
 			rc = EINVAL;
@@ -2280,7 +2284,6 @@ checkerloop (void *ap)
 	struct timespec last_time;
 	struct config *conf;
 	int foreign_tick = 0;
-	bool use_watchdog;
 
 	pthread_cleanup_push(rcu_unregister, NULL);
 	rcu_register_thread();
@@ -2292,11 +2295,15 @@ checkerloop (void *ap)
 	get_monotonic_time(&last_time);
 	last_time.tv_sec -= 1;
 
-	/* use_watchdog is set from process environment and never changes */
 	conf = get_multipath_config();
-	use_watchdog = conf->use_watchdog;
 	put_multipath_config(conf);
 
+#ifdef USE_SYSTEMD
+	/* use_watchdog is set from process environment and never changes */
+	bool use_watchdog;
+	use_watchdog = conf->use_watchdog;
+#endif
+
 	while (1) {
 		struct timespec diff_time, start_time, end_time;
 		int num_paths = 0, strict_timing, rc = 0;