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