fix build breakage

transport/internet/sockopt_linux.go

@@ -14,7 +14,7 @@ const (
 )
 
 func bindAddr(fd uintptr, address net.Address, port net.Port) error {
-	err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+	err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
 	if err != nil {
 		return newError("failed to set resuse_addr").Base(err).AtWarning()
 	}