Most scripts in /rc/bin/patch have "no such patch" type errors which bail
early on if things aren't set up right in /n/sources/patch. patch/list had no
such check, meaning if 'cd /n/sources/patch' fails, it'll happily try the
current dirctory. This change causes it to notice the cd failed and exit
more cleanly. The error was benign, but ugly.

Reference: /n/sources/patch/applied/patch-list-cdfail
Date: Mon Nov 26 06:21:47 CET 2007
Signed-off-by: anthony@strand1.com

--- /rc/bin/patch/list	Mon Nov 26 06:18:35 2007
+++ /rc/bin/patch/list	Mon Nov 26 06:18:34 2007
@@ -7,7 +7,11 @@
 }
 
 pref=''
-cd /n/sources/patch
+cd /n/sources/patch || {
+	echo 'can''t cd /n/sources/patch' >[2=1]
+	exit
+}
+
 if(~ $1 saved sorry applied undecided){
 	pref=$1^'/'
 	shift