[PATCH] fix build error of function iio_event_getfd

[Hui Zhu]

Got a build error:
  CC [M]  drivers/staging/iio/industrialio-core.o
/home/teawater/kernel2/linux/drivers/staging/iio/industrialio-core.c:
In function ‘iio_event_getfd’:
/home/teawater/kernel2/linux/drivers/staging/iio/industrialio-core.c:262:32:
error: ‘ev_int’ undeclared (first use in this function)
/home/teawater/kernel2/linux/drivers/staging/iio/industrialio-core.c:262:32:
note: each undeclared identifier is reported only once for each
function it appears in
Not sure it is fixed or not.
Post a patch for it.

Signed-off-by: Hui Zhu <teawater@xxxxxxxxx>
---
 drivers/staging/iio/industrialio-core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -243,6 +243,7 @@ static const struct file_operations iio_
 static int iio_event_getfd(struct iio_dev *indio_dev)
 {
 	int fd;
+	struct iio_event_interface *ev_int = indio_dev->event_interface;

 	if (indio_dev->event_interface == NULL)
 		return -ENODEV;
--
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