staging: iio: Function iio_get_new_idr_val() return negative value if fails.

[Sonic Zhang]

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@xxxxxxxxx>
Acked-by: Jonathan Cameron <jic23@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/staging/iio/industrialio-core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -537,6 +537,7 @@ static void iio_device_unregister_sysfs(
 	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;
@@ -660,7 +661,7 @@ static int iio_device_register_eventset(
 	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;

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