tty: cyclades: TIOCSERGETLSR should should store to a uint

TIOCSERGETLSR should be saved in a uint so the cast here to unsigned
long is a bug.

Reported-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>