ALSA: hwdep: Return -ENODEV instead of -EFAULT in snd_hwdep_open()

When try_module_get() fails in snd_hwdep_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 hw 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/20260707084506.718583-3-phucduc.bui@gmail.com

sound/core/hwdep.c

diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 973d117..352047e 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -87,7 +87,7 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
 
 	if (!try_module_get(hw->card->module)) {
 		snd_card_unref(hw->card);
-		return -EFAULT;
+		return -ENODEV;
 	}
 
 	init_waitqueue_entry(&wait, current);