X509V3_EXT_add_nconf_sk, X509v3_add_ext: fix errors handling
X509v3_add_ext: free 'sk' if the memory pointed to by it was malloc-ed inside this function. X509V3_EXT_add_nconf_sk: return an error if X509v3_add_ext() fails. This prevents use of a freed memory in do_body:sk_X509_EXTENSION_num(). Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4896)
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cb750375
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