fix sockopt argument type

transport/internet/sockopt_linux.go

@@ -4,7 +4,7 @@ import "syscall"
 
 func applySocketOptions(fd uintptr, config *SocketConfig) error {
 	if config.Mark != 0 {
-		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, config.Mark); err != nil {
+		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
 			return err
 		}
 	}