staging: comedi: usbdux: tidy up usbdux_dio_insn_config()

Tidy up this function a bit.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/usbdux.c

@@ -1273,32 +1273,30 @@ static int usbdux_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 
 static int usbdux_dio_insn_config(struct comedi_device *dev,
 				  struct comedi_subdevice *s,
-				  struct comedi_insn *insn, unsigned int *data)
+				  struct comedi_insn *insn,
+				  unsigned int *data)
 {
-	int chan = CR_CHAN(insn->chanspec);
-
-	/* The input or output configuration of each digital line is
-	 * configured by a special insn_config instruction.  chanspec
-	 * contains the channel to be changed, and data[0] contains the
-	 * value COMEDI_INPUT or COMEDI_OUTPUT. */
+	unsigned int mask = 1 << CR_CHAN(insn->chanspec);
 
 	switch (data[0]) {
 	case INSN_CONFIG_DIO_OUTPUT:
-		s->io_bits |= 1 << chan;	/* 1 means Out */
+		s->io_bits |= mask;
 		break;
 	case INSN_CONFIG_DIO_INPUT:
-		s->io_bits &= ~(1 << chan);
+		s->io_bits &= ~mask;
 		break;
 	case INSN_CONFIG_DIO_QUERY:
-		data[1] =
-		    (s->io_bits & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
+		data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
 		break;
 	default:
 		return -EINVAL;
 		break;
 	}
-	/* we don't tell the firmware here as it would take 8 frames */
-	/* to submit the information. We do it in the insn_bits. */
+
+	/*
+	 * We don't tell the firmware here as it would take 8 frames
+	 * to submit the information. We do it in the insn_bits.
+	 */
 	return insn->n;
 }