iio: scd4x: 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 `calibration_auto_enable` device
attribute of the scd4x driver.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211216185217.1054495-13-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/chemical/scd4x.c

@@ -423,7 +423,7 @@ static ssize_t calibration_auto_enable_show(struct device *dev,
 
 	val = (be16_to_cpu(bval) & SCD4X_READY_MASK) ? 1 : 0;
 
-	return sprintf(buf, "%d\n", val);
+	return sysfs_emit(buf, "%d\n", val);
 }
 
 static ssize_t calibration_auto_enable_store(struct device *dev,