[libpng16] Revised scripts/pnglibconf.dfa
diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index 31f24d0..8eba0e2 100644
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -590,7 +590,8 @@
# Turn this off to disable warning about invalid palette index and
# leave the num_palette_max member out of the png structure.
-option CHECK_FOR_INVALID_INDEX
+option CHECK_FOR_INVALID_INDEX enables READ_CHECK_FOR_INVALID_INDEX
+option CHECK_FOR_INVALID_INDEX enables WRITE_CHECK_FOR_INVALID_INDEX
option READ_CHECK_FOR_INVALID_INDEX requires READ CHECK_FOR_INVALID_INDEX
option WRITE_CHECK_FOR_INVALID_INDEX requires WRITE CHECK_FOR_INVALID_INDEX