Fix #1226 UA_Server_addDataSourceVariableNode always returned GOOD
Fix #1226 UA_Server_addDataSourceVariableNode always returned GOOD

StalderT/open62541,open62541/open62541,open62541/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,open62541/open62541,StalderT/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,JGrothoff/open62541,open62541/open62541,JGrothoff/open62541,StalderT/open62541,StalderT/open62541