ath5k: add missing checks for rfgain probe

rfgain probe is only necessary for OFDM operation on AR5111 and AR5112.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index e00ab5a..3f19e31 100644
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -1604,11 +1604,13 @@
 	int ret;
 
 	if (ah->ah_radio == AR5K_RF5110)
-		ret = ath5k_hw_rf5110_calibrate(ah, channel);
-	else {
-		ret = ath5k_hw_rf511x_iq_calibrate(ah);
+		return ath5k_hw_rf5110_calibrate(ah, channel);
+
+	ret = ath5k_hw_rf511x_iq_calibrate(ah);
+
+	if ((ah->ah_radio == AR5K_RF5111 || ah->ah_radio == AR5K_RF5112) &&
+	    (channel->hw_value & CHANNEL_OFDM))
 		ath5k_hw_request_rfgain_probe(ah);
-	}
 
 	return ret;
 }