Ensure all EVP calls have their returns checked where appropriate

Ensure all EVP calls have their returns checked where appropriate

There are lots of calls to EVP functions from within libssl There were
various places where we should probably check the return value but don't.
This adds these checks.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 56d913467541506572f908a34c32ca7071f77a94)

Conflicts:
	ssl/s3_enc.c
	ssl/s3_srvr.c