iio: adc: meson_saradc: replace sprintf() with sysfs_emit()

Update the 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/meson_saradc.c

···
 		      char *label)
 {
 	if (chan->type == IIO_TEMP)
-		return sprintf(label, "temp-sensor\n");
+		return sysfs_emit(label, "temp-sensor\n");
 	if (chan->type == IIO_VOLTAGE && chan->channel >= NUM_MUX_0_VSS)
-		return sprintf(label, "%s\n",
+		return sysfs_emit(label, "%s\n",
 			       chan7_mux_names[chan->channel - NUM_MUX_0_VSS]);
 	if (chan->type == IIO_VOLTAGE)
-		return sprintf(label, "channel-%d\n", chan->channel);
+		return sysfs_emit(label, "channel-%d\n", chan->channel);
 	return 0;
 }