fix warnings

git-svn-id: http://skia.googlecode.com/svn/trunk@1129 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleMipMap.cpp b/samplecode/SampleMipMap.cpp
index 6e0efe0..fd3f5cf 100644
--- a/samplecode/SampleMipMap.cpp
+++ b/samplecode/SampleMipMap.cpp
@@ -88,7 +88,7 @@
         
         canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
         
-        canvas->scale(1.00000001, 0.9999999);
+        canvas->scale(1.00000001f, 0.9999999f);
 
         drawN2(canvas, fBitmap);