Change append to appendf for call sites with no format arguments.

Original CL: http://codereview.appspot.com/5685062/

Review URL: https://codereview.appspot.com/5686059

git-svn-id: http://skia.googlecode.com/svn/trunk@3225 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/TextBench.cpp b/bench/TextBench.cpp
index 63a7167..ed8fb0e 100644
--- a/bench/TextBench.cpp
+++ b/bench/TextBench.cpp
@@ -81,13 +81,13 @@
     virtual const char* onGetName() {
         fName.printf("text_%g", SkScalarToFloat(fPaint.getTextSize()));
         if (fDoPos) {
-            fName.appendf("_pos");
+            fName.append("_pos");
         }
         fName.appendf("_%s", fontQualityName(fPaint));
         if (SK_ColorBLACK != fPaint.getColor()) {
             fName.appendf("_%02X", fPaint.getAlpha());
         } else {
-            fName.appendf("_BK");
+            fName.append("_BK");
         }
         return fName.c_str();
     }