live-boot syntax errors at shutdown

[Philip Newborough <corenominal@corenominal.org>]

Hello

In similar fashion to a previous report[1] and fix[2], live-boot.init
generates more syntax errors at shutdown.

[1]: http://lists.debian.org/debian-live/2011/01/msg00162.html
[2]: http://live.debian.net/gitweb?p=live-boot.git;a=commitdiff;h=b72b24711cacdb0267c29816a0fd1b96a90836b0

 -- Philip

diff --git a/debian/live-boot.init b/debian/live-boot.init
index 5799c44..ab09d2a 100644
--- a/debian/live-boot.init
+++ b/debian/live-boot.init
@@ -200,7 +200,7 @@ do_stop ()
 				eject -p -m /live/image >/dev/null 2>&1
 			fi
 
-			if [ ${NOPROMPT} = "cd" ]
+			if [ "${NOPROMPT}" = "cd" ]
 			then
 				prompt=
 			fi