lib-storage: pop3c - Copy SSL settings correctly

When attempting to use pop3c with immediate SSL, it would
crash due to invalid memory access during connection setup.
Also the SSL mode is not copied so SSL handshake is not attempted
at later stage.

Was broken in 01435c3 and ebcf7d6

src/lib-storage/index/pop3c/pop3c-client.c

@@ -93,7 +93,6 @@ struct pop3c_client *
 pop3c_client_init(const struct pop3c_client_settings *set)
 {
 	struct pop3c_client *client;
-	struct ssl_iostream_settings ssl_set;
 	const char *error;
 	pool_t pool;
 
@@ -113,11 +112,12 @@ pop3c_client_init(const struct pop3c_client_settings *set)
 		p_strdup(pool, set->dns_client_socket_path);
 	client->set.temp_path_prefix = p_strdup(pool, set->temp_path_prefix);
 	client->set.rawlog_dir = p_strdup(pool, set->rawlog_dir);
+	client->set.ssl_mode = set->ssl_mode;
 
 	if (set->ssl_mode != POP3C_CLIENT_SSL_MODE_NONE) {
 		ssl_iostream_settings_init_from(client->pool, &client->set.ssl_set, &set->ssl_set);
 		client->set.ssl_set.verbose_invalid_cert = !client->set.ssl_set.allow_invalid_cert;
-		if (ssl_iostream_client_context_cache_get(&ssl_set,
+		if (ssl_iostream_client_context_cache_get(&set->ssl_set,
 							  &client->ssl_ctx,
 							  &error) < 0) {
 			i_error("pop3c(%s:%u): Couldn't initialize SSL context: %s",