resubscribe() returns without exhausting all private subscribes

[gadfly16]

In case of private channels resubscribe() returns the subscribeToPrivate functions return value without checking its value, exiting the function and thus the for loop in case of a successfull subscription too. If both channels is subscribed for only one of them will resubscribe.

It should check the error value and only return if the err is not nil, like default:.

[aopoltorzhicky]

Thanks for the issue. It was fixed in #55.