staging:r8188eu: refactor rtw_get_cur_max_rate() - remove rtw_hal_get_hwreg() call

rtw_hal_get_hwreg(..., HW_VAR_RF_TYPE,...) always return RF_1T1R value.
Replace the function call with RF_1T1R value
and refactor rtw_get_cur_max_rate().
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_ioctl_set.c

@@ -569,7 +569,6 @@ u16 rtw_get_cur_max_rate(struct adapter *adapter)
 	struct registry_priv *pregistrypriv = &adapter->registrypriv;
 	struct mlme_priv	*pmlmepriv = &adapter->mlmepriv;
 	struct wlan_bssid_ex  *pcur_bss = &pmlmepriv->cur_network.network;
-	u8	rf_type = 0;
 	u8	bw_40MHz = 0, short_GI_20 = 0, short_GI_40 = 0;
 	u32	ht_ielen = 0;
 
@@ -586,9 +585,8 @@ u16 rtw_get_cur_max_rate(struct adapter *adapter)
 			short_GI_20 = (le16_to_cpu(pmlmeinfo->HT_caps.cap_info) & IEEE80211_HT_CAP_SGI_20) ? 1 : 0;
 			short_GI_40 = (le16_to_cpu(pmlmeinfo->HT_caps.cap_info) & IEEE80211_HT_CAP_SGI_40) ? 1 : 0;
 
-			rtw_hal_get_hwreg(adapter, HW_VAR_RF_TYPE, (u8 *)(&rf_type));
 			max_rate = rtw_mcs_rate(
-				rf_type,
+				RF_1T1R,
 				bw_40MHz & (pregistrypriv->cbw40_enable),
 				short_GI_20,
 				short_GI_40,