gpiolib: cdev: remove pointless decrement of i

Remove pointless decrement of variable, and associated comment.

While i is used subsequently, it is re-initialized so this decrement
serves no purpose.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpiolib-cdev.c

@@ -331,8 +331,6 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
 			offset);
 	}
-	/* Let i point at the last handle */
-	i--;
 	lh->num_descs = handlereq.lines;
 
 	fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);