Comment 2 for bug 1839036

The same commit also introduced the build error:

tests/parse-events.c:1629:4: error: ‘struct evlist_test’ has no member named ‘valid’
   .valid = kvm_s390_create_vm_valid,
    ^~~~~

So "perf tests: Add valid callback for parse-events test" (16ddcfbf7f3d07aa781e26b39f2c28636a4ed2fd) needs to be applied as well as prereq.