Fixing canvas writePixels malfunctioning with SkDeferredCanvas with SkGPipe backend and GPU rendering

BUG=http://code.google.com/p/chromium/issues/detail?id=138935
Review URL: https://codereview.appspot.com/6450045

git-svn-id: http://skia.googlecode.com/svn/trunk@4769 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkDeferredCanvas.cpp b/src/utils/SkDeferredCanvas.cpp
index 494b50c..a36a604 100644
--- a/src/utils/SkDeferredCanvas.cpp
+++ b/src/utils/SkDeferredCanvas.cpp
@@ -732,6 +732,7 @@
         //Special case config: no deferral
         this->flushPending();
         fImmediateDevice->writePixels(bitmap, x, y, config8888);
+        return;
     }
 
     SkPaint paint;