BenchmarkARGBDetect_Unaligned fix off by one in unitest

unit_test/compare_test.cc

 /*
  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 161 matching lines @@
   }
   EXPECT_EQ(0, fourcc);
 
   free_aligned_buffer_64(src_a);
 }
 
 TEST_F(LibYUVBaseTest, BenchmarkARGBDetect_Unaligned) {
   uint32 fourcc;
   const int kMaxTest = benchmark_width_ * benchmark_height_ * 4 + 1;
   align_buffer_64(src_a, kMaxTest);
-  for (int i = 0; i < kMaxTest; ++i) {
-    src_a[i + 1] = 255;
+  for (int i = 1; i < kMaxTest; ++i) {
+    src_a[i] = 255;
   }
 
   src_a[0 + 1] = 0;
   fourcc = ARGBDetect(src_a + 1, benchmark_width_ * 4,
                       benchmark_width_, benchmark_height_);
   EXPECT_EQ(libyuv::FOURCC_BGRA, fourcc);
   src_a[0 + 1] = 255;
   src_a[3 + 1] = 0;
   fourcc = ARGBDetect(src_a + 1, benchmark_width_ * 4,
                       benchmark_width_, benchmark_height_);
@@ skipping 311 matching lines @@
 
   if (kSrcWidth > 8 && kSrcHeight > 8) {
     EXPECT_EQ(opt_err, c_err);
   }
 
   free_aligned_buffer_64(src_a);
   free_aligned_buffer_64(src_b);
 }
 
 }  // namespace libyuv