connectionCount is incremented even no connection is created

[pistej]

If some error/exceptions occurs in borrow() -> createConnection(), variable $connectionCount is incremented but no connection exist (can't be returned to pool), next borrow connection is trying to pop connection from channel but there is no connection ...

I would suggest same fix as in this forked lib, can create MR: eltaline@e5f8b2d

Q: Assume from code, there is no way init (or create connection) again when is closed ?!