Fix 32/64 bit warnings on g++-4.2.

BUG=

Review URL: https://codereview.chromium.org/98343006

git-svn-id: http://skia.googlecode.com/svn/trunk@12470 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/ColorPrivTest.cpp b/tests/ColorPrivTest.cpp
index ddcde5d..19a63c7 100644
--- a/tests/ColorPrivTest.cpp
+++ b/tests/ColorPrivTest.cpp
@@ -15,7 +15,7 @@
     ASSERT(SkUnsplay(ag << 8, rb << 8) == color);
 
     const uint64_t agrb = SkSplay(color);
-    ASSERT(agrb == 0x00A100C300B200D4);
+    ASSERT(agrb == 0x00A100C300B200D4ULL);
     ASSERT(SkUnsplay(agrb<<8) == color);
 }