Staging: Comedi adv_pci1710: Combined two conditions

Combined two if statements making the code cleaner, removing one level
of indentation.
Signed-off-by: Tomas Melin <tomas.melin@iki.fi>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/adv_pci1710.c

@@ -1168,10 +1168,9 @@ static int check_channel_list(struct comedi_device *dev,
 	for (i = 1, seglen = 1; i < n_chan; i++, seglen++) {
 		if (chanlist[0] == chanlist[i])
 			break;	/*  we detected a loop, stop */
-		if (CR_CHAN(chanlist[i]) & 1)
-			if (CR_AREF(chanlist[i]) == AREF_DIFF) {
-				comedi_error(dev,
-					     "Odd channel cannot be differential input!\n");
+		if ((CR_CHAN(chanlist[i]) & 1) &&
+		    (CR_AREF(chanlist[i]) == AREF_DIFF)) {
+			comedi_error(dev, "Odd channel cannot be differential input!\n");
 			return 0;
 		}
 		nowmustbechan =