atm: forever loop loading ambassador firmware

There was a forever loop introduced here when we converted this to
request_firmware() back in 2008.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>