iio: adc: qcom-spmi-rradc: replace snprintf() with sysfs_emit()

Update the rradc_read_label() function to use sysfs_emit() for generating
labels.

Signed-off-by: Nuno Sá <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/qcom-spmi-rradc.c

···
 static int rradc_read_label(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan, char *label)
 {
-	return snprintf(label, PAGE_SIZE, "%s\n",
+	return sysfs_emit(label, "%s\n",
 			rradc_chans[chan->address].label);
 }