Use correct constant when evaluating OpenProducingPointToPointConnect…

…ion() return value.

This was missed when the return type was changed in f68e049.
Resolves GCC warnings about comparing members of different enumerations.

source/src/cip/cipioconnection.c

@@ -1015,7 +1015,7 @@ CipError OpenCommunicationChannels(CipConnectionObject *connection_object) {
 
     if(OpenProducingPointToPointConnection(connection_object,
                                            common_packet_format_data) !=
-       kEipStatusOk) {
+       kCipErrorSuccess) {
       OPENER_TRACE_ERR("error in PointToPoint producing connection\n");
       return kCipErrorConnectionFailure;
     }