Use UID_ and GID_ constants for uid and gid arguments to make_dev()

for the raidctl device.

Select a more conservative default for the permissions for /dev/raidctl
since the operations are performed using ioctl() not read() and write().

Submitted by:	kris
Reviewed by:	scottl

sys/dev/raidframe/rf_freebsdkintf.c

@@ -383,7 +383,8 @@ raidattach(void)
 		return;
 	}
 
-	parent_sc->sc_dev= make_dev(&raidctl_cdevsw, 0, 0, 0, 0644, "raidctl");
+	parent_sc->sc_dev= make_dev(&raidctl_cdevsw, 0, UID_ROOT, GID_WHEEL,
+	    0600, "raidctl");
 	parent_sc->sc_dev->si_drv1 = parent_sc;
 	raidctl_dev = parent_sc->sc_dev;