staging: iio: cdc: remove braces from single line if blocks

Remove braces from single line if blocks to clear checkpatch warnings.
WARNING: braces {} are not necessary for single statement blocks

Signed-off-by: Alexander Vorwerk <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/staging/iio/cdc/ad7746.c

···
 		if (ret < 0)
 			return ret;
 
-		if (chip->capdac_set != chan->channel) {
-
+		if (chip->capdac_set != chan->channel)
 			chip->capdac_set = chan->channel;
-		}
 		break;
 	case IIO_VOLTAGE:
 	case IIO_TEMP: