autofs: fix thinko in validate_dev_ioctl()

I was so sure the per-dentry expire timeout patch worked ok but my
testing was flawed.

In validate_dev_ioctl() the check for ioctl AUTOFS_DEV_IOCTL_TIMEOUT_CMD
should use the ioctl number not the passed in ioctl command.

Fixes: 433f9d76 ("autofs: add per dentry expire timeout")
Cc: <stable@vger.kernel.org> # mainline only
Signed-off-by: Ian Kent <raven@themaw.net>
Link: https://lore.kernel.org/r/20241027224732.5507-1-raven@themaw.net


Signed-off-by: Christian Brauner <brauner@kernel.org>