qlcnic: fix a loop exit condition better

In the original code, if we succeeded on the last iteration through the
loop then we still returned failure.

Fixes: 389e4e04

 ('qlcnic: fix a timeout loop')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>