Fix to return -EPERM from the error handling case instead of 0, as done
elsewhere in this function.

Fixes: b6016b76 ("[BNX2]: New Broadcom gigabit network driver.")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NMichael Chan <michael.chan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>