Ensure that event listener thread does not join on itself

src/main/java/com/fazecast/jSerialComm/SerialPort.java

@@ -1759,10 +1759,11 @@ public final class SerialPort
 			configTimeouts(portHandle, TIMEOUT_NONBLOCKING, 0, 0, 0);
 			setEventListeningStatus(portHandle, false);
 
-			try
-			{
 			// Wait until the event-reading thread returns. This thread MUST return or the serial port will
 			//   be in an unspecified, possibly unrecoverable state
+			try
+			{
+				if (!Thread.currentThread().equals(serialEventThread))
 					do
 					{
 						serialEventThread.join(500);