Bug in EVP_MD_CTX_copy_ex's malloc failure handling

[David Benjamin]

EVP_MD_CTX_copy_ex is implemented with memcpy, followed by manually fixing
up |out->pctx| and |out->md_data|.

https://git.openssl.org/gitweb/?p=openssl.git;a=blob;f=crypto/evp/digest.c;h=5da0e01039a6da039942db9f1bf8b70753f509f2;hb=HEAD#l292

If allocating |out->md_data| fails, then both |out->pctx| and |in->pctx|
may point to the same EVP_PKEY_CTX and freeing |out| will cause problems.

We fixed this by not using memcpy.
https://boringssl.googlesource.com/boringssl/+/306ece31bcaaed49e0240a2e5555f8901ebb2d45%5E%21/crypto/digest/digest.c

David
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