Ensure we don't call memcpy with a NULL pointer
Commit d5aa14dd simplified the bn_expand_internal() and BN_copy() functions. Unfortunately it also removed some checks which are still required, otherwise we call memcpy passing in NULL which is not allowed. Reviewed-by: NTim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2836)
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