staging: comedi: usbdux: checkpatch.pl cleanup (else not useful)

Fix the checkpatch.pl warning:

WARNING: else is not generally useful after a break or return
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/usbdux.c

@@ -1327,13 +1327,13 @@ static int usbdux_pwm_period(struct comedi_device *dev,
 	struct usbdux_private *devpriv = dev->private;
 	int fx2delay = 255;
 
-	if (period < MIN_PWM_PERIOD) {
+	if (period < MIN_PWM_PERIOD)
 		return -EAGAIN;
-	} else {
-		fx2delay = (period / (6 * 512 * 1000 / 33)) - 6;
-		if (fx2delay > 255)
-			return -EAGAIN;
-	}
+
+	fx2delay = (period / (6 * 512 * 1000 / 33)) - 6;
+	if (fx2delay > 255)
+		return -EAGAIN;
+
 	devpriv->pwm_delay = fx2delay;
 	devpriv->pwm_period = period;