shape ops -- fix errors

git-svn-id: http://skia.googlecode.com/svn/trunk@8138 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/Intersection/EdgeWalker_TestUtility.cpp b/experimental/Intersection/EdgeWalker_TestUtility.cpp
index 163bd51..7926ee9 100644
--- a/experimental/Intersection/EdgeWalker_TestUtility.cpp
+++ b/experimental/Intersection/EdgeWalker_TestUtility.cpp
@@ -370,7 +370,7 @@
     for (int y = 0; y < bitHeight; ++y) {
         uint8_t* addr1 = bits.getAddr1(0, y);
         uint8_t* addr2 = bits.getAddr1(bitWidth, y);
-        for (int x = 0; x < bits.rowBytes(); ++x) {
+        for (unsigned x = 0; x < bits.rowBytes(); ++x) {
             SkASSERT(addr1[x] == addr2[x]);
         }
     }