[PATCH] ALSA: seq: oss: Fix error check at system port creation

[Takashi Iwai]

The system port creation in ALSA OSS sequencer was wrongly checked
against to the port number that can be never negative.  The error code
should be checked rather against the ioctl call.

This patch corrects the error check.

Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/core/seq/oss/seq_oss_init.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sound/core/seq/oss/seq_oss_init.c b/sound/core/seq/oss/seq_oss_init.c
index a53d81a86af2..0ee4a5081fd6 100644
--- a/sound/core/seq/oss/seq_oss_init.c
+++ b/sound/core/seq/oss/seq_oss_init.c
@@ -94,11 +94,10 @@ snd_seq_oss_create_client(void)
 	port_callback.event_input = receive_announce;
 	port->kernel = &port_callback;
 	
-	call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, port);
-	system_port = port->addr.port;
-	if (system_port >= 0) {
+	if (call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, port) >= 0) {
 		struct snd_seq_port_subscribe subs;
 
+		system_port = port->addr.port;
 		memset(&subs, 0, sizeof(subs));
 		subs.sender.client = SNDRV_SEQ_CLIENT_SYSTEM;
 		subs.sender.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
-- 
2.26.2