[PATCH] tools lib traceevent: Fix memory leakage in filter_event

[Hewenliang]

It is necessary to call free_arg(arg) when add_filter_type returns NULL in
the function of filter_event.

Signed-off-by: Hewenliang <hewenliang4@xxxxxxxxxx>
---
 tools/lib/traceevent/parse-filter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index f3cbf86e51ac..20eed719542e 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1228,8 +1228,10 @@ filter_event(struct tep_event_filter *filter, struct tep_event *event,
 	}
 
 	filter_type = add_filter_type(filter, event->id);
-	if (filter_type == NULL)
+	if (filter_type == NULL) {
+		free_arg(arg);
 		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
 
 	if (filter_type->filter)
 		free_arg(filter_type->filter);
-- 
2.19.1