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

test/bacnet/bacapp/src/main.c

@@ -570,7 +570,7 @@ static void testBACnetApplicationData_Safe(void)
     BACNET_APPLICATION_DATA_VALUE input_value[13];
     uint32_t len_segment[13];
     uint32_t single_length_segment;
-    BACNET_APPLICATION_DATA_VALUE value;
+    BACNET_APPLICATION_DATA_VALUE value = { 0 };
 
     for (i = 0; i < 13; i++) {
         input_value[i].tag = (BACNET_APPLICATION_TAG)i;