Avoid potential NULL dereference in ssl_set_pkey()

Avoid potential NULL dereference in ssl_set_pkey()

Switch from X509_get_pubkey() to X509_get0_pubkey() to avoid an unnecessary
EVP_PKEY_free(). Check the return values of X509_get0_pubkey() and
EVP_PKEY_copy_parameters(). If the former returns NULL, the latter will
dereference NULL.

CID 25020

ok jsing