Change JDK-8213352 introduced an gtest which does a comparison between an integer and a pointer which is forbidden in C++:

    ASSERT_EQ(NULL, nodes[i]->next());

I don't know why other compilers havn't complained about it, but XLC did.

The fix for this is trivial - just cast NULL to the appropriate pointer type:

    ASSERT_EQ((BufferNode*)NULL, nodes[i]->next());