various: move ptr indicator to return value

src/basic/unit-def.h

@@ -280,7 +280,7 @@ typedef enum NotifyAccess {
         _NOTIFY_ACCESS_INVALID = -EINVAL,
 } NotifyAccess;
 
-char *unit_dbus_path_from_name(const char *name);
+char* unit_dbus_path_from_name(const char *name);
 int unit_name_from_dbus_path(const char *path, char **name);
 
 const char* unit_dbus_interface_from_type(UnitType t);