commit 1df0ace0b4014152d10fe6772ecbf3cb2d014206
author John Bowler <jbowler@acm.org> Wed Jun 22 17:35:49 2016 -0700
committer John Bowler <jbowler@acm.org> Wed Jun 22 17:35:49 2016 -0700
tree 96de2a1a25f518255ecdef847070ca72589d7fe1
parent 4af267c07b935dc1bfaf1889c63a29f8fa15025b

Fix MSVC Level 2 warning

MSVC doesn't like '-(unsigned)', so replace it by 0U-(unsigned) (in 1.6).

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

pngwutil.c

diff --git a/pngwutil.c b/pngwutil.c
index 2e4d1a5..665464b 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -2448,7 +2448,7 @@
       /* Overflow can occur in the calculation, just select the lowest set
        * filter.
        */
-      filter_to_do &= -filter_to_do;
+      filter_to_do &= 0U-filter_to_do;
    }
    else if ((filter_to_do & PNG_FILTER_NONE) != 0 &&
          filter_to_do != PNG_FILTER_NONE)