[PATCH] ALSA: sonicvibes: add error handling for snd_ctl_add

[Zhouyang Jia <jiazhouyang09@gmail.com>]

When snd_ctl_add fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling snd_ctl_add.

Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
 sound/pci/sonicvibes.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/pci/sonicvibes.c b/sound/pci/sonicvibes.c
index a8abb15..57cb77a 100644
--- a/sound/pci/sonicvibes.c
+++ b/sound/pci/sonicvibes.c
@@ -1188,6 +1188,7 @@ SONICVIBES_SINGLE("Joystick Speed", 0, SV_IREG_GAME_PORT, 1, 15, 0);
 static int snd_sonicvibes_create_gameport(struct sonicvibes *sonic)
 {
 	struct gameport *gp;
+	int err;
 
 	sonic->gameport = gp = gameport_allocate_port();
 	if (!gp) {
@@ -1203,7 +1204,10 @@ static int snd_sonicvibes_create_gameport(struct sonicvibes *sonic)
 
 	gameport_register_port(gp);
 
-	snd_ctl_add(sonic->card, snd_ctl_new1(&snd_sonicvibes_game_control, sonic));
+	err = snd_ctl_add(sonic->card,
+		snd_ctl_new1(&snd_sonicvibes_game_control, sonic));
+	if (err < 0)
+		return err;
 
 	return 0;
 }
-- 
2.7.4