[devel] Simplified the pngvalid error-handling code

 now that cexcept.h is in place.
diff --git a/CHANGES b/CHANGES
index 7e81ab6..4bb6e16 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3009,6 +3009,7 @@
   Reformatted/rearranged pngvalid.c to assist use of progressive reader.
   Check interlaced images in pngvalid
   Clarified pngusr.h comments in pnglibconf.dfa
+  Simplified the pngvalid error-handling code now that cexcept.h is in place.
 
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