Fixed BACNET_APPLICATION_DATA_VALUE declarations to be initialized so that the next pointer is NULL by default. (#814)

test/bacnet/basic/object/access_door/src/main.c

@@ -30,7 +30,7 @@ static void test_object_access_door(void)
     int test_len = 0;
     BACNET_READ_PROPERTY_DATA rpdata;
     /* for decode value data */
-    BACNET_APPLICATION_DATA_VALUE value;
+    BACNET_APPLICATION_DATA_VALUE value = { 0 };
     const int *pRequired = NULL;
     const int *pOptional = NULL;
     const int *pProprietary = NULL;