iio: as3935: Use sysfs_emit()

sysfs_emit() is preferred over raw s*printf() for sysfs attributes since it
knows about the sysfs buffer specifics and has some built-in checks for
size and alignment.

Use sysfs_emit() to format the custom `noise_level_tripped` device
attribute of the as3935 driver.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211216185217.1054495-6-lars@metafoo.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/proximity/as3935.c

@@ -122,7 +122,7 @@ static ssize_t as3935_sensor_sensitivity_show(struct device *dev,
 		return ret;
 	val = (val & AS3935_AFE_MASK) >> 1;
 
-	return sprintf(buf, "%d\n", val);
+	return sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t as3935_sensor_sensitivity_store(struct device *dev,
@@ -153,7 +153,7 @@ static ssize_t as3935_noise_level_tripped_show(struct device *dev,
 	int ret;
 
 	mutex_lock(&st->lock);
-	ret = sprintf(buf, "%d\n", !time_after(jiffies, st->noise_tripped + HZ));
+	ret = sysfs_emit(buf, "%d\n", !time_after(jiffies, st->noise_tripped + HZ));
 	mutex_unlock(&st->lock);
 
 	return ret;