perf evsel: perf_evsel__name(NULL) is valid, no need to check evsel

It'll return "unknown", no need to open code it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-4okvjmm18arjrcyfhuahgfxm@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-report.c

@@ -298,7 +298,7 @@ static int process_read_event(struct perf_tool *tool,
 	struct report *rep = container_of(tool, struct report, tool);
 
 	if (rep->show_threads) {
-		const char *name = evsel ? perf_evsel__name(evsel) : "unknown";
+		const char *name = perf_evsel__name(evsel);
 		int err = perf_read_values_add_value(&rep->show_threads_values,
 					   event->read.pid, event->read.tid,
 					   evsel->idx,

tools/perf/util/session.c

@@ -1246,7 +1246,7 @@ static void dump_read(struct perf_evsel *evsel, union perf_event *event)
 		return;
 
 	printf(": %d %d %s %" PRIu64 "\n", event->read.pid, event->read.tid,
-	       evsel ? perf_evsel__name(evsel) : "FAIL",
+	       perf_evsel__name(evsel),
 	       event->read.value);
 
 	if (!evsel)