pgsql: Go over all OpenSSL return values and make sure we compare them

[mha(at)postgresql(dot)org (Magnus Hagander)]

Log Message:
-----------
Go over all OpenSSL return values and make sure we compare them
to the documented API value. The previous code got it right as
it's implemented, but accepted too much/too little compared to
the API documentation.

Per comment from Zdenek Kotala.

Tags:
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REL7_4_STABLE

Modified Files:
--------------
    pgsql/src/backend/libpq:
        be-secure.c (r1.43.2.4 -> r1.43.2.5)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/be-secure.c?r1=1.43.2.4&r2=1.43.2.5)
    pgsql/src/interfaces/libpq:
        fe-secure.c (r1.32.2.1 -> r1.32.2.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-secure.c?r1=1.32.2.1&r2=1.32.2.2)