Fix minor memory leaks

https://codereview.chromium.org/12703044/



git-svn-id: http://skia.googlecode.com/svn/trunk@8419 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/dashing.cpp b/gm/dashing.cpp
index 7fe3029..bbd0b65 100644
--- a/gm/dashing.cpp
+++ b/gm/dashing.cpp
@@ -202,7 +202,7 @@
 
         SkScalar intervals[2] = { dashLength, dashLength };
 
-        p.setPathEffect(new SkDashPathEffect(intervals, 2, phase, false));
+        p.setPathEffect(new SkDashPathEffect(intervals, 2, phase, false))->unref();
 
         SkPoint pts[2];