Function iio_get_new_idr_val() return negative value if fails.
So, only error when ret < 0 in iio_device_register_eventset().

Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>
---
 drivers/staging/iio/industrialio-core.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index b456dfc..dd9267c 100644
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -536,6 +536,7 @@ static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
 	sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs);
 }
 
+/* This function return negative value if fails. */
 int iio_get_new_idr_val(struct idr *this_idr)
 {
 	int ret;
@@ -659,7 +660,7 @@ static int iio_device_register_eventset(struct iio_dev *dev_info)
 	for (i = 0; i < dev_info->num_interrupt_lines; i++) {
 		dev_info->event_interfaces[i].owner = dev_info->driver_module;
 		ret = iio_get_new_idr_val(&iio_event_idr);
-		if (ret)
+		if (ret < 0)
 			goto error_free_setup_ev_ints;
 		else
 			dev_info->event_interfaces[i].id = ret;
-- 
1.6.0



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