ath11k: delete a stray unlock in ath11k_dbg_htt_stats_req()

The callers unlock this lock so this error path has a double unlock.

Fixes: d5c65159 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -4287,7 +4287,6 @@ int ath11k_dbg_htt_stats_req(struct ath11k *ar)
 	ret = ath11k_dp_tx_htt_h2t_ext_stats_req(ar, type, &cfg_params, cookie);
 	if (ret) {
 		ath11k_warn(ar->ab, "failed to send htt stats request: %d\n", ret);
-		mutex_unlock(&ar->conf_mutex);
 		return ret;
 	}