Paul Yang 7e3ae24832 Fix a bundle of mischecks of return values
Several EVP_PKEY_xxxx functions return 0 and a negative value for
indicating errors. Some places call these functions with a zero return
value check only, which misses the check for the negative scenarios.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10055)
2019-09-30 17:18:17 +08:00
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