perf parse-events: Fixes relating to no_value terms

A term may have no value in which case it is assumed to have a value
of 1. It doesn't just apply to alias/event terms so change the
parse_events_term__to_strbuf assert.

Commit 99e7138eb7897aa0 ("perf tools: Fail on using multiple bits long
terms without value") made it so that no_value terms could only be for a
single bit. Prior to commit 64199ae4b8a3 ("perf parse-events: Fix
propagation of term's no_value when cloning") this missed a test case
where config1 had no_value.

Fixes: 64199ae4b8a36038 ("perf parse-events: Fix propagation of term's no_value when cloning")
Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/parse-events.c

···
 
 static const struct evlist_test test__events_pmu[] = {
 	{
-		.name  = "cpu/config=10,config1,config2=3,period=1000/u",
+		.name  = "cpu/config=10,config1=1,config2=3,period=1000/u",
 		.valid = test__pmu_cpu_valid,
 		.check = test__checkevent_pmu,
 		/* 0 */

tools/perf/util/parse-events.c

···
 
 		if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
 			if (term->no_value) {
-				assert(term->type_term == PARSE_EVENTS__TERM_TYPE_USER);
+				assert(term->val.num == 1);
 				ret = strbuf_addf(sb, "%s", term->config);
 			} else
 				ret = strbuf_addf(sb, "%s=%#"PRIx64, term->config, term->val.num);

tools/perf/util/parse-events.h

···
 	 */
 	bool weak;
 	/**
-	 * @no_value: Is there no value. TODO: this should really be part of
-	 * type_val.
+	 * @no_value: Is there no value. If a numeric term has no value then the
+	 * value is assumed to be 1. An event name also has no value.
 	 */
 	bool no_value;
 };