fix(core): Don't process any more chunks if the SecureChannel is closing
fix(core): Don't process any more chunks if the SecureChannel is closing

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