iio: ti_am335x_adc: add missing .driver_module to struct iio_info

Add missing .driver_module of struct iio_info. This prevents the
module from being removed from underneath its users.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 5f9a7e7..985f588 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -134,6 +134,7 @@
 
 static const struct iio_info tiadc_info = {
 	.read_raw = &tiadc_read_raw,
+	.driver_module = THIS_MODULE,
 };
 
 static int tiadc_probe(struct platform_device *pdev)