ath10k: remove set but not used variable 'tlv_len'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/wireless/ath/ath10k/wmi-tlv.c: In function 'ath10k_wmi_tlv_op_gen_config_pno_start':
drivers/net/wireless/ath/ath10k/wmi-tlv.c:3455:6: warning:
 variable 'tlv_len' set but not used [-Wunused-but-set-variable]

It never used since inroduction in commit
ce834e28 ("ath10k: support NET_DETECT WoWLAN feature")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath10k/wmi-tlv.c

@@ -3455,7 +3455,6 @@ ath10k_wmi_tlv_op_gen_config_pno_start(struct ath10k *ar,
 	struct wmi_tlv *tlv;
 	struct sk_buff *skb;
 	__le32 *channel_list;
-	u16 tlv_len;
 	size_t len;
 	void *ptr;
 	u32 i;
@@ -3513,8 +3512,6 @@ ath10k_wmi_tlv_op_gen_config_pno_start(struct ath10k *ar,
 	/* nlo_configured_parameters(nlo_list) */
 	cmd->no_of_ssids = __cpu_to_le32(min_t(u8, pno->uc_networks_count,
 					       WMI_NLO_MAX_SSIDS));
-	tlv_len = __le32_to_cpu(cmd->no_of_ssids) *
-		sizeof(struct nlo_configured_parameters);
 
 	tlv = ptr;
 	tlv->tag = __cpu_to_le16(WMI_TLV_TAG_ARRAY_STRUCT);