evswitch__init
ret = evswitch__init(&report.evswitch, session->evlist, stderr);
err = evswitch__init(&script.evswitch, session->evlist, stderr);
status = evswitch__init(&top.evswitch, top.evlist, stderr);
err = evswitch__init(&trace.evswitch, trace.evlist, stderr);
int evswitch__init(struct evswitch *evswitch, struct evlist *evlist, FILE *fp);