kernel: nuke creds wrapper

* Little bit complicated, so let's remove it.

Signed-off-by: rsuntk <rsuntk@yukiprjkt.my.id>

kernel/manager.h

@@ -21,8 +21,8 @@ static inline bool ksu_is_manager_uid_valid()
 
 static inline bool is_manager()
 {
-	return unlikely(ksu_is_any_manager(ksu_current_uid()) ||
-			ksu_manager_uid == ksu_current_uid());
+	return unlikely(ksu_is_any_manager(current_uid()) ||
+			ksu_manager_uid == current_uid());
 }
 
 static inline uid_t ksu_get_manager_uid()