ath9k: remove useless conditional

ath9k_hw_keyreset returns true in either branch.
Signed-off-by: NBob Copeland <me@bobcopeland.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/hw.c

@@ -7193,9 +7193,6 @@ bool ath9k_hw_keyreset(struct ath_hal *ah, u16 entry)
 
 	}
 
-	if (ah->ah_curchan == NULL)
-		return true;
-
 	return true;
 }