ossl.c: NULL check
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45271 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ossl.c: NULL check
error reasons with old OpenSSL, and insert a colon iff formatted
message is not empty.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45271 b2dd03c8-39d4-4d8f-98ff-823fe69b080e