Fixed bug that caused /dev/null to be created as file before being created

as special file

etc/Makefile

@@ -18,6 +18,7 @@ install::
 	sh mtree.sh mtree/minix.tree
 	@for f in $(FILES3); do if [ -f $(USRETC)/$$f ]; then :; else cp usr/$$f $(USRETC); chmod 755 $(USRETC)/$$f; fi; done
 	@echo "Making devices.."
+	cd /dev && sh /usr/src/commands/scripts/MAKEDEV.sh null 
 	cd /dev && sh /usr/src/commands/scripts/MAKEDEV.sh std  2>/dev/null
 	@echo "Making user homedirs.."
 	for u in bin ast root; do (cd ast && tar cf - .[a-z]* ) | (cd ~$$u && tar xf - ); chown -R $$u ~$$u; done