John Bowler 09dcb906a7 Remove unsigned overflow ...

The previous code always results in an unsigned arithmetic overflow,
this is well defined but produces errors from clang with the option to
detect unsigned overflow.  As the expression only gets evaluated once
per row in this version of libpng it is easier just to rewrite it.

Signed-off-by: John Bowler <jbowler@acm.org>

2016-12-26 16:27:33 -08:00

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