[x265] [PATCH] Fix: scaling_list_delta_coef out of range

[tamura at pegasys-inc.com]

# HG changeset patch
# User Masaharu Tamura <tamura at pegasys-inc.com>
# Date 1551769822 -32400
#      Tue Mar 05 16:10:22 2019 +0900
# Node ID c32f7d697eb32e19789caf4c0304d0e1ab276b7d
# Parent  31ab7e09a3b5b15ffcc532826d4dd5d37e611483
Fix: scaling_list_delta_coef out of range.

diff -r 31ab7e09a3b5 -r c32f7d697eb3 source/encoder/entropy.cpp
--- a/source/encoder/entropy.cpp	Tue Feb 26 13:52:24 2019 +0530
+++ b/source/encoder/entropy.cpp	Tue Mar 05 16:10:22 2019 +0900
@@ -530,6 +530,10 @@
     for (int i = 0; i < coefNum; i++)
     {
         data = src[scan[i]] - nextCoef;
+        if (data < -128)
+            data += 256;
+        if (data > 127)
+            data -= 256;
         nextCoef = (nextCoef + data + 256) % 256;
         WRITE_SVLC(data,  "scaling_list_delta_coef");
     }