[PATCH 29/63] perf map: Allow map__next() to receive a NULL arg

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Just like free(), return NULL in that case, will simplify the
for_each_entry_safe() iterators.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-pbde2ucn49khnrebclys9pny@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/map.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index c9ba49566981..86d8d187f872 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -1007,7 +1007,7 @@ struct map *maps__first(struct maps *maps)
 	return NULL;
 }
 
-struct map *map__next(struct map *map)
+static struct map *__map__next(struct map *map)
 {
 	struct rb_node *next = rb_next(&map->rb_node);
 
@@ -1016,6 +1016,11 @@ struct map *map__next(struct map *map)
 	return NULL;
 }
 
+struct map *map__next(struct map *map)
+{
+	return map ? __map__next(map) : NULL;
+}
+
 struct kmap *__map__kmap(struct map *map)
 {
 	if (!map->dso || !map->dso->kernel)
-- 
2.21.0