Use variable[] instead of GCC variable[0] syntax

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/stat.h b/stat.h
index b9e0448..4ca8261 100644
--- a/stat.h
+++ b/stat.h
@@ -186,7 +186,7 @@
 	 * Network 'copy' of run_str[]
 	 */
 	uint32_t nr_threads;
-	uint8_t run_str[0];
+	uint8_t run_str[];
 };
 
 extern void show_thread_status(struct thread_stat *ts, struct group_run_stats *rs);