[tip:perf/core] perf map: Use zalloc for map_groups

[tip-bot for John Keeping]

Commit-ID:  ab6cd0e5276e24403751e0b3b8ed807738a8571f
Gitweb:     https://git.kernel.org/tip/ab6cd0e5276e24403751e0b3b8ed807738a8571f
Author:     John Keeping <john@xxxxxxxxxxxx>
AuthorDate: Thu, 15 Aug 2019 11:01:44 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 16 Aug 2019 12:25:23 -0300

perf map: Use zalloc for map_groups

In the next commit we will add new fields to map_groups and we need
these to be null if no value is assigned.  The simplest way to achieve
this is to request zeroed memory from the allocator.

Signed-off-by: John Keeping <john@xxxxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: john keeping <john@xxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20190815100146.28842-1-john@xxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/map.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 668410b1d426..44b556812e4b 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -636,7 +636,7 @@ bool map_groups__empty(struct map_groups *mg)
 
 struct map_groups *map_groups__new(struct machine *machine)
 {
-	struct map_groups *mg = malloc(sizeof(*mg));
+	struct map_groups *mg = zalloc(sizeof(*mg));
 
 	if (mg != NULL)
 		map_groups__init(mg, machine);