Incorrect CIP_PDC_CONNECTION_CFG_T:bMaxConnectionCnt handling enables additional PDC connections

The field CIP_PDC_CONNECTION_CFG_T:bMaxConnectionCnt allows to limit the number of parallel connnections that can open a connection endpoint of the PDC object. Exclusive owner connections are naturally limited to a value of 1 but for listen-only and input-only, this parameter can be used to further partition the overall supported number of I/O transports on a per-connection basis.

A bug has been discovered with the implementation resulting in the following error pattern.

If, e.g., an input-only connection has aleady been opened bMaxConnectionCnt times, the subsequent connection attempt fails as expected with error code GSR_NO_RESOURCE. Another attempt however will succeed after that, due to a bad system state being caused in the previous GSR_NO_RESOURCE error path.