ath9k_common: get rid of an unnecessary variable

There's no need to truncate curchan->hw_value to u8

Signed-off-by: Felix Fietkau <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/ath/ath9k/common.c

···
 {
 	struct ieee80211_channel *curchan = chandef->chan;
 	struct ath9k_channel *channel;
-	u8 chan_idx;
 
-	chan_idx = curchan->hw_value;
-	channel = &ah->channels[chan_idx];
+	channel = &ah->channels[curchan->hw_value];
 	ath9k_cmn_update_ichannel(channel, chandef);
 
 	return channel;