ath9k: remove spurious check for channel on keycache reset

ath9k_hw_keyreset() has a spurious check for ah->curchan..
remove it.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -2496,9 +2496,6 @@ bool ath9k_hw_keyreset(struct ath_hw *ah, u16 entry)
 
 	}
 
-	if (ah->curchan == NULL)
-		return true;
-
 	return true;
 }