fix return value for render_pictures
Review URL: https://codereview.appspot.com/6590049

git-svn-id: http://skia.googlecode.com/svn/trunk@5779 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/render_pictures_main.cpp b/tools/render_pictures_main.cpp
index 55ecf38..da0740a 100644
--- a/tools/render_pictures_main.cpp
+++ b/tools/render_pictures_main.cpp
@@ -316,6 +316,7 @@
 #endif
 
     SkDELETE(renderer);
+    return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS