--- a/targets/plc_debug.c	Sat Mar 29 14:49:48 2014 +0100
+++ b/targets/plc_debug.c	Sat Mar 29 19:03:00 2014 +0100
@@ -291,8 +291,7 @@
 void FreeDebugData(void)
 {
     /* atomically mark buffer as free */
-    long latest_state;
-    latest_state = AtomicCompareExchange(
+    AtomicCompareExchange(
         &buffer_state,
         BUFFER_BUSY,
         BUFFER_FREE);