wifi: mt76: Remove redundant assignment to variable tidno

The variable tidno is being assigned a value that is not being read
and is being re-assigned a new value a few statements later.
The assignment is redundant and can be removed.

Cleans up clang scan warning:
drivers/net/wireless/mediatek/mt76/agg-rx.c:125:5: warning: Value stored
to 'tidno' during its initialization is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Felix Fietkau <[e-mail]>

drivers/net/wireless/mediatek/mt76/agg-rx.c

···
 	struct ieee80211_bar *bar = mt76_skb_get_hdr(skb);
 	struct mt76_wcid *wcid = status->wcid;
 	struct mt76_rx_tid *tid;
-	u8 tidno = status->qos_ctl & IEEE80211_QOS_CTL_TID_MASK;
+	u8 tidno;
 	u16 seqno;
 
 	if (!ieee80211_is_ctl(bar->frame_control))