ALSA: control: preserve snd_card_file_add() error code in snd_ctl_open()

snd_ctl_open() unconditionally overwrites the return value of
snd_card_file_add() with -ENODEV on failure, discarding the actual
error code.

Fix this by directly returning the original error code returned by
snd_card_file_add() (e.g. -ENOMEM or -ENODEV). This behavior is
consistent with the error handling used in other functions such as
snd_mixer_oss_open(), snd_hwdep_open(), snd_pcm_oss_open(), and others.

There is no functional change other than the returned error code in this
failure path.

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/20260708023540.6962-1-phucduc.bui@gmail.com

sound/core/control.c

diff --git a/sound/core/control.c b/sound/core/control.c
index 0ca9fff5..73d7ba0f5 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -63,10 +63,8 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
 		goto __error1;
 	}
 	err = snd_card_file_add(card, file);
-	if (err < 0) {
-		err = -ENODEV;
+	if (err < 0)
 		goto __error1;
-	}
 	if (!try_module_get(card->module)) {
 		err = -ENODEV;
 		goto __error2;