SingleEntrantLock: use reference comparison

mirai-core/src/commonMain/kotlin/utils/SingleEntrantLock.kt

@@ -1,10 +1,10 @@
 /*
- * Copyright 2019-2021 Mamoe Technologies and contributors.
+ * Copyright 2019-2022 Mamoe Technologies and contributors.
  *
- *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
  *
- *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ * https://github.com/mamoe/mirai/blob/dev/LICENSE
  */
 
 package net.mamoe.mirai.internal.utils
@@ -17,7 +17,7 @@ internal class SingleEntrantLock {
 
     inline fun <R> withLock(locker: Any, crossinline block: () -> R): R? {
         return synchronized(this) {
-            if (this.locker == locker) return null
+            if (this.locker === locker) return null
             this.locker = locker
             block().also {
                 this.locker = null