wifi: ath12k: fix memory leak in ath12k_qmi_driver_event_work()

Currently the buffer pointed by event is not freed in case
ATH12K_FLAG_UNREGISTERING bit is set, this causes memory leak.

Add a goto skip instead of return, to ensure event and all the
list entries are freed properly.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Signed-off-by: Rajat Soni <quic_rajson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230315090632.15065-1-quic_rajson@quicinc.com

drivers/net/wireless/ath/ath12k/qmi.c

@@ -2991,7 +2991,7 @@ static void ath12k_qmi_driver_event_work(struct work_struct *work)
 		spin_unlock(&qmi->event_lock);
 
 		if (test_bit(ATH12K_FLAG_UNREGISTERING, &ab->dev_flags))
-			return;
+			goto skip;
 
 		switch (event->type) {
 		case ATH12K_QMI_EVENT_SERVER_ARRIVE:
@@ -3032,6 +3032,8 @@ static void ath12k_qmi_driver_event_work(struct work_struct *work)
 			ath12k_warn(ab, "invalid event type: %d", event->type);
 			break;
 		}
+
+skip:
 		kfree(event);
 		spin_lock(&qmi->event_lock);
 	}