dont blindly remove all the /usr/local/plan9
diff --git a/lib/moveplan9.sh b/lib/moveplan9.sh
index 631d41c..c34b725 100644
--- a/lib/moveplan9.sh
+++ b/lib/moveplan9.sh
@@ -1,6 +1,12 @@
 #!/bin/sh
 
 p=`cleanname $PLAN9`
+if [ X"$p" = X"" ]
+then
+	echo cleanname failed 1>&2
+	exit 1
+fi
+
 cd $PLAN9
 echo "
 	X ,s;/usr/local/plan9($|/|});$p\\1;g