only set HOME if not already set; ok deraadt@

src/etc/root/dot.profile

@@ -1,10 +1,10 @@
-# $OpenBSD: dot.profile,v 1.4 2004/05/10 16:04:07 peter Exp $
+# $OpenBSD: dot.profile,v 1.5 2005/03/30 21:18:33 millert Exp $
 #
 # sh/ksh initialization
 
 PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/sbin:/usr/local/bin
 export PATH
-HOME=/root
+: ${HOME='/root'}
 export HOME
 umask 022