perf tools: Fix error index for pmu event parser

For events we provide specific error message we need to set error column
index, PMU parser is missing that, adding it.

Before:

$ perf stat -e cycles,krava/cycles/ kill
event syntax error: 'cycles,krava/cycles/'
\___ Cannot find PMU `krava'. Missing kernel support?

After:

$ perf stat -e cycles,krava/cycles/ kill
event syntax error: 'cycles,krava/cycles/'
\___ Cannot find PMU `krava'. Missing kernel support?

Signed-off-by: Jiri Olsa <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Cc: Milian Wolff <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/parse-events.y

···
 event_pmu:
 PE_NAME opt_pmu_config
 {
+	struct parse_events_state *parse_state = _parse_state;
+	struct parse_events_error *error = parse_state->error;
 	struct list_head *list, *orig_terms, *terms;
 
 	if (parse_events_copy_term_list($2, &orig_terms))
 		YYABORT;
+
+	if (error)
+		error->idx = @1.first_column;
 
 	ALLOC_LIST(list);
 	if (parse_events_add_pmu(_parse_state, list, $1, $2, false, false)) {