staging: comedi: usbdux: fix more sparse endianness warnings

Sparse shows a couple of warnings like:

drivers/staging/comedi/drivers/usbdux.c:889:20: warning: incorrect type in assignment (different base types)
drivers/staging/comedi/drivers/usbdux.c:889:20:    expected unsigned short [unsigned] [short] [usertype] <noident>
drivers/staging/comedi/drivers/usbdux.c:889:20:    got restricted __le16 [usertype] <noident>

This is the result of a couple of calls to cpu_to_le16() being assigned to
uint16_t typed variables.  Switch the types of these variables/pointers to
__le16 accordingly.

Signed-off-by: Chase Southwood <chase.southwood@gmail.com>
Suggested-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/usbdux.c

@@ -868,7 +868,7 @@ static int usbdux_ao_insn_write(struct comedi_device *dev,
 	struct usbdux_private *devpriv = dev->private;
 	unsigned int chan = CR_CHAN(insn->chanspec);
 	unsigned int val = s->readback[chan];
-	uint16_t *p = (uint16_t *)&devpriv->dux_commands[2];
+	__le16 *p = (__le16 *)&devpriv->dux_commands[2];
 	int ret = -EBUSY;
 	int i;
 
@@ -1180,7 +1180,7 @@ static int usbdux_counter_write(struct comedi_device *dev,
 {
 	struct usbdux_private *devpriv = dev->private;
 	unsigned int chan = CR_CHAN(insn->chanspec);
-	uint16_t *p = (uint16_t *)&devpriv->dux_commands[2];
+	__le16 *p = (__le16 *)&devpriv->dux_commands[2];
 	int ret = 0;
 	int i;