Tests: Fix some warnings from the check library on OpenBSD
Tests: Fix some warnings from the check library on OpenBSD

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