ath11k: Fix possible memleak in ath11k_qmi_init_service

When qmi_add_lookup fail, we should destroy the workqueue

Fixes: d5c65159 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1595237804-66297-1-git-send-email-wangyufen@huawei.com

drivers/net/wireless/ath/ath11k/qmi.c

@@ -2648,6 +2648,7 @@ int ath11k_qmi_init_service(struct ath11k_base *ab)
 			     ab->qmi.service_ins_id);
 	if (ret < 0) {
 		ath11k_warn(ab, "failed to add qmi lookup\n");
+		destroy_workqueue(ab->qmi.event_wq);
 		return ret;
 	}