Fix unmounting [..]/dev once more (issue #50)

diff --git a/grml-debootstrap b/grml-debootstrap
index c926544..cf9d00b 100755 (executable)
--- a/grml-debootstrap
+++ b/grml-debootstrap
@@ -1130,7 +1130,7 @@ finalize_vm() {
 
   umount "${MNTPOINT}"/proc
   umount "${MNTPOINT}"/sys
-  umount "${MNTPOINT}"/dev
+  try_umount 3 "${MNTPOINT}"/dev
   umount "${MNTPOINT}"
   kpartx -d "${ORIG_TARGET}" >/dev/null
 }