VirtualBox additions - small patch for 8.99.46

[Chavdar Ivanov <ci4ic4%gmail.com@localhost>]

--- /p/VirtualBox-6.0.8/src/VBox/Additions/common/VBoxGuest/VBoxGuest-netbsd.c.ORIG
       2019-06-19 19:48:40.880337377 +0100
+++ /p/VirtualBox-6.0.8/src/VBox/Additions/common/VBoxGuest/VBoxGuest-netbsd.c
 2019-06-19 19:48:51.063261324 +0100
@@ -1011,7 +1011,7 @@

             error = do_sys_mknod(curlwp, "/dev/vboxguest",
                                  0666|S_IFCHR, makedev(cmajor, 0),
-                                 &retval, UIO_SYSSPACE);
+                                 UIO_SYSSPACE);
             if (error == EEXIST)
                 error = 0;
             break;

Needed after 8.99.46.

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