fix(tests): Fix a compiler warning in check_server_asyncop
fix(tests): Fix a compiler warning in check_server_asyncop

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