tools:iio:iio_event_monitor: save right errno

Move up error handling code to preserve the errno coming from ioctl(),
before it may be changed by close().

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index f6fdab48d340..578390db1bec 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -275,15 +275,17 @@ int main(int argc, char **argv)
         }
 
         ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
-
-        close(fd);
-
         if (ret == -1 || event_fd == -1) {
                 ret = -errno;
                 fprintf(stdout, "Failed to retrieve event fd\n");
+                if (close(fd) == -1)
+                        perror("Failed to close character device file");
+
                 goto error_free_chrdev_name;
         }
 
+        close(fd);
+
         while (true) {
                 ret = read(event_fd, &event, sizeof(event));
                 if (ret == -1) {