PVS-Studio warning V549 for Chromium

void DiskCacheEntryTest::ExternalSyncIOBackground(....) {
  ....
  scoped_refptr<net::IOBuffer>
    buffer1(new net::IOBuffer(kSize1));
  scoped_refptr<net::IOBuffer>
    buffer2(new net::IOBuffer(kSize2));
  ....
  EXPECT_EQ(0, memcmp(buffer2->data(), buffer2->data(), 10000));
  ....
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V549 The first argument of 'memcmp' function is equal to the second argument. entry_unittest.cc 393

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/