Clean up the chroot tree before trying to remove it, just in case

there's some leftover junk from a previous failed build.

debian/changelog

@@ -1,8 +1,13 @@
 livecd-rootfs (0.87) UNRELEASED; urgency=low
 
+  [ Timo Aaltonen ]
   * livecd.sh: Don't mess with xorg.conf anymore, we don't install one
     by default.
 
+  [ Colin Watson ]
+  * Clean up the chroot tree before trying to remove it, just in case
+    there's some leftover junk from a previous failed build.
+
  -- Timo Aaltonen <tjaalton@ubuntu.com>  Tue, 30 Jun 2009 23:20:20 +0300
 
 livecd-rootfs (0.86) karmic; urgency=low

livecd.sh

@@ -160,6 +160,9 @@ for FS in "$@"; do
 
     select_mirror
 
+    # Just in case there's some leftover junk here:
+    cleanup 2>/dev/null || true
+
     rm -rf ${ROOT}
 
     mkdir -p ${ROOT}var/cache/debconf