staging:rtl8192u: Rename EEPROM_PwDiff - Style

Rename the constant EEPROM_PwDiff to EEPROM_PW_DIFF. This change clears
the checkpatch issue with CamelCase naming.

This is a coding style change which should not 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_core.c

@@ -2445,7 +2445,7 @@ static int rtl8192_read_eeprom_info(struct net_device *dev)
 		priv->TSSI_13dBm = priv->EEPROMThermalMeter * 100;
 		/* read antenna tx power offset of B/C/D to A from EEPROM */
 		if (bLoad_From_EEPOM) {
-			ret = eprom_read(dev, (EEPROM_PwDiff >> 1));
+			ret = eprom_read(dev, (EEPROM_PW_DIFF >> 1));
 			if (ret < 0)
 				return ret;
 			priv->EEPROMPwDiff = ((u16)ret & 0x0f00) >> 8;

drivers/staging/rtl8192u/r8192U_hw.h

@@ -39,7 +39,7 @@
 
 #define EEPROM_TX_POWER_DIFF	0x1F
 #define EEPROM_THERMAL_METER	0x20
-#define EEPROM_PwDiff		0x21	//0x21
+#define EEPROM_PW_DIFF		0x21	//0x21
 #define EEPROM_CrystalCap	0x22	//0x22
 
 #define EEPROM_TxPwIndex_CCK	0x23	//0x23