perf tools: Simplify evsel__add_modifier()

Since it doesn't set the exclude_guest, no need to special handle the
bit and simply show only if one of host or guest bit is set. Now the
default event name might not have :H prefix anymore so change the
dlfilter test not to compare the ":" at the end.

Reviewed-by: Ian Rogers <[e-mail]>
Reviewed-by: James Clark <[e-mail]>
Reviewed-by: Ravi Bangoria <[e-mail]>
Acked-by: Kan Liang <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Atish Patra <[e-mail]>
Cc: Mingwei Zhang <[e-mail]>
Cc: Kajol Jain <[e-mail]>
Cc: Thomas Richter <[e-mail]>
Cc: Palmer Dabbelt <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/dlfilters/dlfilter-test-api-v0.c

···
 	CHECK_SAMPLE(raw_callchain_nr);
 	CHECK(!sample->raw_callchain);
 
-#define EVENT_NAME "branches:"
+#define EVENT_NAME "branches"
 	CHECK(!strncmp(sample->event, EVENT_NAME, strlen(EVENT_NAME)));
 
 	return 0;

tools/perf/dlfilters/dlfilter-test-api-v2.c

···
 	CHECK_SAMPLE(raw_callchain_nr);
 	CHECK(!sample->raw_callchain);
 
-#define EVENT_NAME "branches:"
+#define EVENT_NAME "branches"
 	CHECK(!strncmp(sample->event, EVENT_NAME, strlen(EVENT_NAME)));
 
 	return 0;

tools/perf/util/evsel.c

···
 {
 	int colon = 0, r = 0;
 	struct perf_event_attr *attr = &evsel->core.attr;
-	bool exclude_guest_default = false;
 
 #define MOD_PRINT(context, mod)	do {					\
 		if (!attr->exclude_##context) {				\
···
 		MOD_PRINT(kernel, 'k');
 		MOD_PRINT(user, 'u');
 		MOD_PRINT(hv, 'h');
-		exclude_guest_default = true;
 	}
 
 	if (attr->precise_ip) {
 		if (!colon)
 			colon = ++r;
 		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
-		exclude_guest_default = true;
 	}
 
-	if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
+	if (attr->exclude_host || attr->exclude_guest) {
 		MOD_PRINT(host, 'H');
 		MOD_PRINT(guest, 'G');
 	}