test: refactor test-process-kill-null
Use common.mustCall() instead of called variable.
Checklist
-
make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Use common.mustCall() instead of called variable.
make -j4 test (UNIX), or vcbuild test (Windows) passestest