Handle failed connections right

ext/mysqlnd/mysqlnd.c

@@ -1261,10 +1261,12 @@ MYSQLND_METHOD(mysqlnd_conn, close)(MYSQLND * conn, enum_connection_close_type c
 	DBG_ENTER("mysqlnd_conn::close");
 	DBG_INF_FMT("conn=%llu", conn->thread_id);
 
-	MYSQLND_INC_CONN_STATISTIC(&conn->stats, stat);
-	MYSQLND_DEC_CONN_STATISTIC(&conn->stats, STAT_OPENED_CONNECTIONS);
-	if (conn->persistent) {
-		MYSQLND_DEC_CONN_STATISTIC(&conn->stats, STAT_OPENED_PERSISTENT_CONNECTIONS);
+	if (conn->state >= CONN_READY) {
+		MYSQLND_INC_CONN_STATISTIC(&conn->stats, stat);
+		MYSQLND_DEC_CONN_STATISTIC(&conn->stats, STAT_OPENED_CONNECTIONS);
+		if (conn->persistent) {
+			MYSQLND_DEC_CONN_STATISTIC(&conn->stats, STAT_OPENED_PERSISTENT_CONNECTIONS);
+		}
 	}
 
 	/*