Properly handle timeout case in lxc-shutdown

Signed-off-by: Christian Seiler <christian@iwakd.de>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

src/lxc/lxc-shutdown.in

@@ -28,6 +28,7 @@ usage() {
 }
 
 alarm() {
+    trap 'exit 0' TERM
     pid=$1
     timeout=$2
     sleep $timeout
@@ -139,6 +140,7 @@ while ! lxc-info -n $lxc_name --state-is STOPPED; do
 done
 
 if [ $timeout != "-1" ]; then
+    trap - EXIT
     kill $alarmpid
 fi