Input: uinput - unlock on allocation failure in ioctl

We have to unlock before returning if input_allocate_device() fails.

Fixes: 04ce40a61a91 ("Input: uinput - remove uinput_allocate_device()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/uinput.c

@@ -857,8 +857,10 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
 
 	if (!udev->dev) {
 		udev->dev = input_allocate_device();
-		if (!udev->dev)
-			return -ENOMEM;
+		if (!udev->dev) {
+			retval = -ENOMEM;
+			goto out;
+		}
 	}
 
 	switch (cmd) {