ALSA: pcm: oss: Return -ENODEV instead of -EFAULT in snd_pcm_oss_open()

When try_module_get() fails in snd_pcm_oss_open(), the owning module is
going away and the device is no longer usable, so -EFAULT ("bad address")
is the wrong error. Return -ENODEV, matching the other unavailable-device
paths in this function(the NULL pcm check and the card->shutdown check).
This changes the errno reported to userspace on this rare race.
No other behaviour changes.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260707084506.718583-6-phucduc.bui@gmail.com

sound/core/oss/pcm_oss.c

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 0d7818e..8ae4375 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -2507,7 +2507,7 @@ static int snd_pcm_oss_open(struct inode *inode, struct file *file)
 	if (err < 0)
 		goto __error1;
 	if (!try_module_get(pcm->card->module)) {
-		err = -EFAULT;
+		err = -ENODEV;
 		goto __error2;
 	}
 	if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {