Fix uninitialized vars

mirai-core/src/androidMain/kotlin/net/mamoe/mirai/utils/io/PlatformSocket.kt

@@ -30,9 +30,16 @@ actual class PlatformSocket : Closeable {
     private lateinit var socket: Socket
 
     actual val isOpen: Boolean
-        get() = socket.isConnected
+        get() =
+            if (::socket.isInitialized)
+                socket.isConnected
+            else false
 
-    actual override fun close() = socket.close()
+    actual override fun close() {
+        if (::socket.isInitialized) {
+            socket.close()
+        }
+    }
 
     @PublishedApi
     internal lateinit var writeChannel: BufferedOutputStream

mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/io/PlatformSocket.kt

@@ -30,7 +30,10 @@ actual class PlatformSocket : Closeable {
     private lateinit var socket: Socket
 
     actual val isOpen: Boolean
-        get() = socket.isConnected
+        get() =
+            if (::socket.isInitialized)
+                socket.isConnected
+            else false
 
     actual override fun close() {
         if (::socket.isInitialized) {