Fix warnings in daemon-related modules

compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/experimental/integration/CompilerDaemonTest.kt

@@ -1,9 +1,9 @@
 /*
- * Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the license/LICENSE.txt file.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-@file:OptIn(ExperimentalPathApi::class)
+@file:OptIn(ExperimentalPathApi::class, DelicateCoroutinesApi::class)
 
 package org.jetbrains.kotlin.daemon.experimental.integration
 

compiler/daemon/daemon-tests/test/org/jetbrains/kotlin/daemon/experimental/unit/ClientSerializationTest.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.daemon.experimental.unit
 
 import io.ktor.network.sockets.aSocket
 import io.ktor.util.*
+import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.async
 import kotlinx.coroutines.runBlocking
@@ -31,6 +32,7 @@ class TestServer(val serverPort: Int = 6999) {
     private val serverSocket = aSocket(selectorMgr).tcp().bind(InetSocketAddress(serverPort))
     private val log = Logger.getLogger("TestServer")
 
+    @OptIn(DelicateCoroutinesApi::class)
     fun awaitClient() = GlobalScope.async {
         log.info("accepting clientSocket...")
         val client = serverSocket.accept()
@@ -61,7 +63,7 @@ class ClientSerializationTest : KotlinIntegrationTestBase() {
             }
         }
         log.info("printed")
-        var client2: T? = null
+        var client2: T?
         var connected = false
         runBlocking {
             val clientAwait = testServer.awaitClient()