staging:rtl8192u: Remove member diff_TH - Style

The member variable diff_TH is assigned a constant value and then used
in a comparison. The variable is never changed so the comparison can
as easily be performed directly with the defined constant.

The member variable has been removed and the defined constant
RxPathSelection_diff_TH renamed to RX_PATH_SELECTION_DIFF_TH, to clear
the checkpatch issue with CamelCase naming.

These are coding style changes which should have no impact on runtime
code execution.

Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r8192U_dm.c

@@ -2385,7 +2385,6 @@ static void dm_init_rxpath_selection(struct net_device *dev)
 	u8 i;
 	struct r8192_priv *priv = ieee80211_priv(dev);
 
-	DM_RxPathSelTable.diff_TH = RxPathSelection_diff_TH;
 	if (priv->CustomerID == RT_CID_819x_Netcore)
 		DM_RxPathSelTable.cck_method = CCK_RX_VERSION_2;
 	else
@@ -2555,7 +2554,7 @@ static void dm_rxpath_sel_byrssi(struct net_device *dev)
 	}
 
 	if (tmp_min_rssi < RX_PATH_SELECTION_SS_TH_LOW && disabled_rf_cnt < 2) {
-		if ((tmp_max_rssi - tmp_min_rssi) >= DM_RxPathSelTable.diff_TH) {
+		if ((tmp_max_rssi - tmp_min_rssi) >= RX_PATH_SELECTION_DIFF_TH) {
 			/* record the enabled rssi threshold */
 			DM_RxPathSelTable.rf_enable_rssi_th[min_rssi_index] = tmp_max_rssi+5;
 			/* disable the BB Rx path, OFDM */

drivers/staging/rtl8192u/r8192U_dm.h

@@ -38,7 +38,7 @@
 #define		DM_DIG_MIN_Netcore			0x12
 
 #define		RX_PATH_SELECTION_SS_TH_LOW		30
-#define		RxPathSelection_diff_TH			18
+#define		RX_PATH_SELECTION_DIFF_TH			18
 
 #define		RateAdaptiveTH_High			50
 #define		RateAdaptiveTH_Low_20M		30
@@ -132,7 +132,6 @@ struct dynamic_rx_path_sel {
 	enum cck_rx_path_method		cck_method;
 	u8		cck_rx_path;
 
-	u8		diff_TH;
 	u8		disabledRF;
 	u8		reserved;