Marcus Hüwe authored Mar 02, 2018 and Matěj Cepl committed Mar 04, 2018

Without this change self.m2_ssl_free(self.ssl) is never called,
because m2.bio_noclose is defined as "0". Hence, the if-condition
is always false.  This got broken in commit e2f707b1 ("SSL
package: Port to python3").

Note that these testcases rely on the "fact" (or CPython
implementation detail?) that "del s" calls s' __del__ method.