Method closePort

app/src/main/java/com/sun/mail/pop3/POP3Store.java:458–463

(POP3Folder owner)

	}

    synchronized void closePort(POP3Folder owner) {
	if (portOwner == owner) {
	    port = null;
	    portOwner = null;
	}
    }

    @Override
    public synchronized void close() throws MessagingException {