Fix clang-tidy warning

Change-Id: I9b83db5fc654e3a1ee606f241790b41ff711749b
diff --git a/av1/qmode_rc/ducky_encode.h b/av1/qmode_rc/ducky_encode.h
index 9f5d4fd..abe2bea 100644
--- a/av1/qmode_rc/ducky_encode.h
+++ b/av1/qmode_rc/ducky_encode.h
@@ -79,7 +79,8 @@
   std::vector<FIRSTPASS_STATS> ComputeFirstPassStats();
   void StartEncode(const std::vector<FIRSTPASS_STATS> &stats_list);
 
-  TplGopStats ObtainTplStats(const GopStruct gop_struct, bool rate_dist_flag);
+  TplGopStats ObtainTplStats(const GopStruct gop_struct,
+                             bool rate_dist_present);
 
   std::vector<TplGopStats> ComputeTplStats(
       const GopStructList &gop_list,