core: correct return value from reload methods

Return 1 from *_reload() methods to signify "we did something", just
like in *_start(). This causes "Reloading foo..." messages to be logged.
"Reloaded foo." messages are already logged.

src/core/mount.c

@@ -1025,7 +1025,7 @@ static int mount_reload(Unit *u) {
         assert(m->state == MOUNT_MOUNTED);
 
         mount_enter_remounting(m);
-        return 0;
+        return 1;
 }
 
 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {

src/core/service.c

@@ -1974,7 +1974,7 @@ static int service_reload(Unit *u) {
         assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
 
         service_enter_reload(s);
-        return 0;
+        return 1;
 }
 
 _pure_ static bool service_can_reload(Unit *u) {