[PATCH] [traceevent] add_new_comm(): Fix memory leak

[Gaurav Singh <gaurav1086@gmail.com>]

The pointer cmdlines need to be explicity freed in case the
realloc() fails. Fix it by adding a free() if realloc()
returns a NULL pointer.

Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>
---
 tools/lib/traceevent/event-parse.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index e1bd2a93c6db..7f0133420931 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -284,12 +284,13 @@ static int add_new_comm(struct tep_handle *tep,
 		return 0;
 	}
 
-	cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (tep->cmdline_count + 1));
-	if (!cmdlines) {
+	struct tep_cmdline *new_cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (tep->cmdline_count + 1));
+	if (!new_cmdlines) {
+		free(cmdlines);
 		errno = ENOMEM;
 		return -1;
 	}
-	tep->cmdlines = cmdlines;
+	tep->cmdlines = new_cmdlines;
 
 	key.comm = strdup(comm);
 	if (!key.comm) {
-- 
2.17.1