Fix more clang tautological-constant-out-of-range-compare errors.

And one of unused-private-field:
samplecode/SampleStrokeText.cpp:109:10: error: private field 'fAA' is not used [-Werror,-Wunused-private-field]
    bool fAA;

R=bsalomon@google.com,reed@google.com

Review URL: https://codereview.chromium.org/12906016

git-svn-id: http://skia.googlecode.com/svn/trunk@8445 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleStrokeText.cpp b/samplecode/SampleStrokeText.cpp
index 4e9fe0d..aa19017 100644
--- a/samplecode/SampleStrokeText.cpp
+++ b/samplecode/SampleStrokeText.cpp
@@ -106,9 +106,8 @@
 }
 
 class StrokeTextView : public SampleView {
-    bool fAA;
 public:
-    StrokeTextView() : fAA(false) {
+    StrokeTextView() {
         this->setBGColor(0xFFCC8844);
     }