tty_unlock is used on all other exits from the function.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Acked-by: NJiri Slaby <jslaby@suse.cz>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>