Allows evsel__id_hdr_size to be used when the evsel is const.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/evsel.c | 2 +-
 tools/perf/util/evsel.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 38a74d6dde49..49cc71511c0c 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -3048,7 +3048,7 @@ int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
 	return 0;
 }
 
-u16 evsel__id_hdr_size(struct evsel *evsel)
+u16 evsel__id_hdr_size(const struct evsel *evsel)
 {
 	u64 sample_type = evsel->core.attr.sample_type;
 	u16 size = 0;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 4316992f6a69..15acf293e12a 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -442,7 +442,7 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
 				  u64 *timestamp);
 
-u16 evsel__id_hdr_size(struct evsel *evsel);
+u16 evsel__id_hdr_size(const struct evsel *evsel);
 
 static inline struct evsel *evsel__next(struct evsel *evsel)
 {
-- 
2.46.0.184.g6999bdac58-goog