libpq: Fix SNI host handling

Fix handling of NULL host name (possibly by using hostaddr).  It
previously crashed.  Also, we should look at connhost, not pghost, to
handle multi-host specifications.

Also remove an unnecessary SSL_CTX_free().

Reported-by: Jacob Champion <[email protected]>
Reviewed-by: Michael Paquier <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/37e1cce4ddf0be362e3093cee55493aee41bc423

Modified Files
--------------
src/interfaces/libpq/fe-secure-openssl.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)

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