openssl: only say we're connected if the connection succeeded

ssl_close uses this boolean to know if SSL_shutdown should be called.
It turns out OpenSSL auto-shutdowns on failure, so if the call to
SSL_connect fails, it will complain about "shutdown while in init",
trampling the original error.

src/streams/openssl.c

@@ -586,8 +586,6 @@ int openssl_connect(git_stream *stream)
 	if ((ret = git_stream_connect(st->io)) < 0)
 		return ret;
 
-	st->connected = true;
-
 	bio = BIO_new(git_stream_bio_method);
 	GITERR_CHECK_ALLOC(bio);
 
@@ -602,6 +600,8 @@ int openssl_connect(git_stream *stream)
 	if ((ret = SSL_connect(st->ssl)) <= 0)
 		return ssl_set_error(st->ssl, ret);
 
+	st->connected = true;
+
 	return verify_server_cert(st->ssl, st->host);
 }