Fix keil compilation error (#418)

* Fix compilation error when using the Keil tools with the Keil compiler.
diff --git a/queue.c b/queue.c
index 08d3799..f3899ae 100644
--- a/queue.c
+++ b/queue.c
@@ -2756,11 +2756,10 @@
                               const char * pcQueueName ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */

     {

         UBaseType_t ux;

+        QueueRegistryItem_t * pxEntryToWrite = NULL;

 

         configASSERT( xQueue );

 

-        QueueRegistryItem_t * pxEntryToWrite = NULL;

-

         if( pcQueueName != NULL )

         {

             /* See if there is an empty space in the registry.  A NULL name denotes