doc: fix uinput device creation warnings

The example code for creating uinput devices produces the following
warnings:

warning: unused variable ‘ev’ [-Wunused-variable]
   | struct input_event ev[2];
   |                    ^~
warning: unused variable ‘new_fd’ [-Wunused-variable]
   | int fd, new_fd, uifd;
   |         ^~~~~~
warning: ‘err’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   |     return err;
   |            ^~~

Signed-off-by: José Expósito <jose.exposito89@gmail.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/libevdev/libevdev-uinput.h b/libevdev/libevdev-uinput.h
index 4b21f8a..b54ec02 100644
--- a/libevdev/libevdev-uinput.h
+++ b/libevdev/libevdev-uinput.h
@@ -42,14 +42,13 @@ struct libevdev_uinput;
  *
  * @code
  * int err;
- * int fd, new_fd, uifd;
+ * int fd, uifd;
  * struct libevdev *dev;
  * struct libevdev_uinput *uidev;
- * struct input_event ev[2];
  *
  * fd = open("/dev/input/event0", O_RDONLY);
  * if (fd < 0)
- *     return err;
+ *     return -errno;
  *
  * err = libevdev_new_from_fd(fd, &dev);
  * if (err != 0)