ALSA: caiaq: Don't abort when no input device is available

The previous fix to handle the error from setup_card() caused a
regression for the models that have no dedicated input device;
snd_usb_caiaq_input_init() just returns -EINVAL, and we treat it as a
fatal error although it should be ignored.

As a regression fix, change the error code to -ENODEV, and ignore this
error in the callee, to continue probing.

Fixes: 28abd224db ("ALSA: caiaq: Handle probe errors properly")
Cc: <stable@vger.kernel.org>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=221423
Link: https://patch.msgid.link/20260427145642.6637-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/caiaq/device.c

@@ -366,7 +366,7 @@ static int setup_card(struct snd_usb_caiaqdev *cdev)
 
 #ifdef CONFIG_SND_USB_CAIAQ_INPUT
 	ret = snd_usb_caiaq_input_init(cdev);
-	if (ret < 0) {
+	if (ret < 0 && ret != -ENODEV) {
 		dev_err(dev, "Unable to set up input system (ret=%d)\n", ret);
 		return ret;
 	}

sound/usb/caiaq/input.c

@@ -804,7 +804,7 @@ int snd_usb_caiaq_input_init(struct snd_usb_caiaqdev *cdev)
 
 	default:
 		/* no input methods supported on this device */
-		ret = -EINVAL;
+		ret = -ENODEV;
 		goto exit_free_idev;
 	}