Fix minor memory leaks

gm/dashing.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
@@ skipping 184 matching lines @@
         p.setColor(SK_ColorBLACK);
         p.setStyle(SkPaint::kStroke_Style);
         p.setStrokeWidth(SkIntToScalar(strokeWidth));
 
         if (circles) {
             p.setStrokeCap(SkPaint::kRound_Cap);
         }
 
         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];
 
         for (int y = 0; y < 100; y += 10*strokeWidth) {
             pts[0].set(0, SkIntToScalar(y));
             pts[1].set(lineLength, SkIntToScalar(y));
 
             canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
         }
 
@@ skipping 85 matching lines @@
 
 //////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* F0(void*) { return new DashingGM; }
 static skiagm::GM* F1(void*) { return new Dashing2GM; }
 static skiagm::GM* F2(void*) { return new Dashing3GM; }
 
 static skiagm::GMRegistry gR0(F0);
 static skiagm::GMRegistry gR1(F1);
 static skiagm::GMRegistry gR2(F2);