Small fix for visualbench

bench/GLVertexAttributesBench.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkImageEncoder.h"
@@ skipping 235 matching lines @@
 }
 
 void GLVertexAttributesBench::teardown(const GrGLInterface* gl) {
     // teardown
     GR_GL_CALL(gl, BindBuffer(GR_GL_ARRAY_BUFFER, 0));
     GR_GL_CALL(gl, BindTexture(GR_GL_TEXTURE_2D, 0));
     GR_GL_CALL(gl, BindFramebuffer(GR_GL_FRAMEBUFFER, 0));
     GR_GL_CALL(gl, DeleteTextures(1, &fTexture));
     GR_GL_CALL(gl, DeleteProgram(fProgram));
     GR_GL_CALL(gl, DeleteBuffers(fBuffers.count(), fBuffers.begin()));
+    fBuffers.reset();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new GLVertexAttributesBench(0) )
 DEF_BENCH( return new GLVertexAttributesBench(1) )
 DEF_BENCH( return new GLVertexAttributesBench(2) )
 DEF_BENCH( return new GLVertexAttributesBench(3) )
 DEF_BENCH( return new GLVertexAttributesBench(4) )
 DEF_BENCH( return new GLVertexAttributesBench(5) )
 DEF_BENCH( return new GLVertexAttributesBench(6) )
 DEF_BENCH( return new GLVertexAttributesBench(7) )
 #endif