Fix build warning: reference cannot be bound to dereferenced null pointer in well-defined C++ code;…

src/core/SkStroke.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkStrokerPriv.h"
 #include "SkGeometry.h"
 #include "SkPath.h"
@@ skipping 1536 matching lines @@
         }
     }
 
 private:
     SkPath          fTmpDst;
     const SkPath&   fSrc;
     bool            fSwapWithSrc;
 };
 
 void SkStroke::strokePath(const SkPath& src, SkPath* dst) const {
-    SkASSERT(&src != NULL && dst != NULL);
+    SkASSERT(dst);
 
     SkScalar radius = SkScalarHalf(fWidth);
 
     AutoTmpPath tmp(src, &dst);
 
     if (radius <= 0) {
         return;
     }
 
     // If src is really a rect, call our specialty strokeRect() method
@@ skipping 172 matching lines @@
         default:
             break;
     }
 
     if (fWidth < SkMinScalar(rw, rh) && !fDoFill) {
         r = rect;
         r.inset(radius, radius);
         dst->addRect(r, reverse_direction(dir));
     }
 }