Revert "added a short delay and comment to boolean operator in CDC"

This reverts commit ade4893f585e3e94fa6cf683620e1d12afc88ecd.

cores/arduino/CDC.cpp

@@ -213,19 +213,10 @@ size_t Serial_::write(uint8_t c)
 	return 0;
 }
 
-// This operator is a convenient way for a sketch to check whether the
-// port has actually been configured and opened by the host (as opposed
-// to just being connected to the host).  It can be used, for example, in 
-// setup() before printing to ensure that an application on the host is
-// actually ready to receive and display the data.
-// We add a short delay before returning to fix a bug observed by Federico
-// where the port is configured (lineState != 0) but not quite opened.
 Serial_::operator bool() {
-	bool result = false;
-	if (_usbLineInfo.lineState > 0) 
-		result = true;
-	delay(10);
-	return result;
+	if (_usbLineInfo.lineState > 0)
+		return true;
+	return false;
 }
 
 Serial_ Serial;