ath9k: remove (u16) casts from rtc register access

The RTC register offsets don't fit into 'u16' on the AR913x, so we have
to remove the existing casts.

Changes-licensed-under: ISC

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/reg.h b/drivers/net/wireless/ath9k/reg.h
index 2dffe37..150eda5 100644
--- a/drivers/net/wireless/ath9k/reg.h
+++ b/drivers/net/wireless/ath9k/reg.h
@@ -953,7 +953,7 @@
 
 #define AR_RTC_BASE             0x00020000
 #define AR_RTC_RC \
-	(AR_SREV_9100(ah)) ? (AR_RTC_BASE + 0x0000) : 0x7000
+	((AR_SREV_9100(ah)) ? (AR_RTC_BASE + 0x0000) : 0x7000)
 #define AR_RTC_RC_M		0x00000003
 #define AR_RTC_RC_MAC_WARM      0x00000001
 #define AR_RTC_RC_MAC_COLD      0x00000002
@@ -961,7 +961,7 @@
 #define AR_RTC_RC_WARM_RESET    0x00000008
 
 #define AR_RTC_PLL_CONTROL \
-	(AR_SREV_9100(ah)) ? (AR_RTC_BASE + 0x0014) : 0x7014
+	((AR_SREV_9100(ah)) ? (AR_RTC_BASE + 0x0014) : 0x7014)
 
 #define AR_RTC_PLL_DIV          0x0000001f
 #define AR_RTC_PLL_DIV_S        0