ath9k: simplify ath9k_hw_get_scaled_power function

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -293,9 +293,7 @@ u16 ath9k_hw_get_max_edge_power(u16 freq, struct cal_ctl_edges *pRdEdgesPower,
 u16 ath9k_hw_get_scaled_power(struct ath_hw *ah, u16 power_limit,
 			      u8 antenna_reduction)
 {
-	u16 scaled_power;
-
-	scaled_power = power_limit - antenna_reduction;
+	u16 reduction = antenna_reduction;
 
 	/*
 	 * Reduce scaled Power by number of chains active
@@ -305,22 +303,19 @@ u16 ath9k_hw_get_scaled_power(struct ath_hw *ah, u16 power_limit,
 	case 1:
 		break;
 	case 2:
-		if (scaled_power > REDUCE_SCALED_POWER_BY_TWO_CHAIN)
-			scaled_power -= REDUCE_SCALED_POWER_BY_TWO_CHAIN;
-		else
-			scaled_power = 0;
+		reduction += REDUCE_SCALED_POWER_BY_TWO_CHAIN;
 		break;
 	case 3:
-		if (scaled_power > REDUCE_SCALED_POWER_BY_THREE_CHAIN)
-			scaled_power -= REDUCE_SCALED_POWER_BY_THREE_CHAIN;
-		else
-			scaled_power = 0;
+		reduction += REDUCE_SCALED_POWER_BY_THREE_CHAIN;
 		break;
 	}
 
-	scaled_power = max((u16)0, scaled_power);
+	if (power_limit > reduction)
+		power_limit -= reduction;
+	else
+		power_limit = 0;
 
-	return scaled_power;
+	return power_limit;
 }
 
 void ath9k_hw_update_regulatory_maxpower(struct ath_hw *ah)