USB: keyspan_pda: remove bogus disconnect test from dtr_rts

Remove bogus (and unnecessary) test for serial->dev being NULL in
dtr_rts.

The device is never cleared, and disconnect is handled for dtr_rts in
usb-serial core anyway.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/keyspan_pda.c

@@ -595,12 +595,10 @@ static void keyspan_pda_dtr_rts(struct usb_serial_port *port, int on)
 {
 	struct usb_serial *serial = port->serial;
 
-	if (serial->dev) {
-		if (on)
-			keyspan_pda_set_modem_info(serial, (1<<7) | (1<< 2));
-		else
-			keyspan_pda_set_modem_info(serial, 0);
-	}
+	if (on)
+		keyspan_pda_set_modem_info(serial, (1 << 7) | (1 << 2));
+	else
+		keyspan_pda_set_modem_info(serial, 0);
 }