s3: Simplify winbindd_ads.c:trusted_domains()

s3: Simplify winbindd_ads.c:trusted_domains()

No real code change, this just removes an indentation by turning

if ( NT_STATUS_IS_OK(result) && trusts.count) {

into

if (!NT_STATUS_IS_OK(result)) {
        return result;
}
if (trusts.count == 0) {
        return NT_STATUS_OK;
}