PEM_write_PUBKEY segfault with 1.0.0 on windows

[Kenneth Goldman]

I'm getting a PEM_write_PUBKEY() segfault.  This is existing code that 
works 
with 0.9.8 with Windows or 1.0.0. with Linux, but fails with 1.0.0. and 
Windows. 
What's my latent bug?

Here's a small sample that fails:

    RSA *rsa = RSA_generate_key(512, 65537, NULL, NULL);
    EVP_PKEY *pkey = EVP_PKEY_new();
    EVP_PKEY_assign_RSA(pkey, rsa);
    FILE *file = fopen("tmp.pem", "wb");

    PEM_write_PUBKEY(file, pkey);

In my actual application, I set rsa->n and rsa->e to bignums that 
I generate.  I think that should be enough to write the public key.