Clean up more Visual Studio warnings, including apparent bug in Arithmetic mode.



git-svn-id: http://skia.googlecode.com/svn/trunk@3645 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkArithmeticMode.cpp b/src/effects/SkArithmeticMode.cpp
index cf651e1..45464c2 100644
--- a/src/effects/SkArithmeticMode.cpp
+++ b/src/effects/SkArithmeticMode.cpp
@@ -66,7 +66,7 @@
 
             int a, r, g, b;
 
-            if (!srcNeedsUnpremul && !srcNeedsUnpremul) {
+            if (!srcNeedsUnpremul && !dstNeedsUnpremul) {
                 a = arith(k1, k2, k3, k4, sa, sa);
                 r = arith(k1, k2, k3, k4, SkGetPackedR32(sc), SkGetPackedR32(dc));
                 g = arith(k1, k2, k3, k4, SkGetPackedG32(sc), SkGetPackedG32(dc));