USB: serial: keyspan_pda: drop unused firmware reset status

Drop the unused firmware reset status which would already have been
logged.

This suppresses the corresponding W=1 (-Wunused-but-set-variable)
warning.
Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NJohan Hovold <johan@kernel.org>

drivers/usb/serial/keyspan_pda.c

@@ -664,11 +664,10 @@ static void keyspan_pda_close(struct usb_serial_port *port)
 /* download the firmware to a "fake" device (pre-renumeration) */
 static int keyspan_pda_fake_startup(struct usb_serial *serial)
 {
-	int response;
 	const char *fw_name;
 
 	/* download the firmware here ... */
-	response = ezusb_fx1_set_reset(serial->dev, 1);
+	ezusb_fx1_set_reset(serial->dev, 1);
 
 	if (0) { ; }
 #ifdef KEYSPAN