fix warnings

git-svn-id: http://skia.googlecode.com/svn/trunk@1129 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleBlur.cpp b/samplecode/SampleBlur.cpp
index 8fbcc71..d2ea2b0 100644
--- a/samplecode/SampleBlur.cpp
+++ b/samplecode/SampleBlur.cpp
@@ -94,8 +94,8 @@
                 } else {
                     paint.setMaskFilter(NULL);
                 }
-                canvas->drawCircle(200 + gRecs[i].fCx*100,
-                                   200 + gRecs[i].fCy*100, 50, paint);
+                canvas->drawCircle(200 + gRecs[i].fCx*100.f,
+                                   200 + gRecs[i].fCy*100.f, 50, paint);
             }
             // draw text
             {