[libpng16]  Don't check palette indexes if num_palette is 0 (as it can be in

MNG files).
diff --git a/CHANGES b/CHANGES
index 1ed594f..d52e35a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4131,7 +4131,8 @@
     update the value when it actually increases, move test for whether
     the check is wanted out of the function.
 
-Version 1.6.0beta24 [June 6, 2012]
+Version 1.6.0beta24 [June 7, 2012]
+  Don't check palette indexes if num_palette is 0 (as it can be in MNG files).
 
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