inet_aton() has a non-traditional return value

src/core/settings.c

 	struct in_addr ipv4;
 	int rc;
 	
-	if ( ( rc = inet_aton ( value, &ipv4 ) ) != 0 )
+	if ( ( rc = inet_aton ( value, &ipv4 ) ) == 0 )
 		return rc;
 	option = set_dhcp_option ( context->options, setting->tag,
 				   &ipv4, sizeof ( ipv4 ) );