gpsdate.init: Make the killing of gpsdate work on the target

When the initscript is called gpsdate it might kill itself before
it has a way to start the new gpsdate process. Use pidof with the
full path to the gpsdate binary to avoid this.

gpsdate.init

@@ -52,7 +52,7 @@ case "$1" in
   stop)
     # This should use start-stop-daemon and create a pid file
     echo "Stopping gpsdate in a brutal way"
-    killall -9 gpsdate
+    kill -9 `pidof $DAEMON`
     ;;
 
   restart)