ALSA: usb-audio: qcom: clear opened when stream enable fails

On enable, subs->opened is set before the service_interval is validated;
an invalid interval jumps to the response label without clearing it, so
the substream is wedged at -EBUSY until a disable or disconnect.

Clear subs->opened on the enable error path.

Fixes: 326bbc3 ("ALSA: usb-audio: qcom: Introduce QC USB SND offloading support")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Link: https://patch.msgid.link/20260618025126.1862954-3-michael.bommarito@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: mjbommar

sound/usb/qcom/qc_audio_offload.c

@@ -1620,8 +1620,13 @@ static void handle_uaudio_stream_req(struct qmi_handle *handle,
 	if (req_msg->service_interval_valid) {
 		ret = get_data_interval_from_si(subs,
 						req_msg->service_interval);
-		if (ret == -EINVAL)
+		if (ret == -EINVAL) {
+			if (req_msg->enable) {
+				guard(mutex)(&chip->mutex);
+				subs->opened = 0;
+			}
 			goto response;
+		}
 
 		datainterval = ret;
 	}