Initialize pointers in param id by the book (explicit NULL assignment,
rather than just memset 0).
In x509_verify_param_zero() set peername to NULL after freeing it.
In x509_vfy.c's internal check_hosts(), avoid potential leak of
possibly already non-NULL peername. This is only set when a check
succeeds, so don't need to do this repeatedly in the loop.
Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit a0724ef1c9b9e2090bdd96b784f492b6a3952957)
39c76ceb2d