rtlwifi: rtl8821ae: Fix HW_VAR_NAV_UPPER operation

The cast here is wrong.  We want to cast the pointer but we accidentally
do a no-op cast of the value.  We normally want to set us_nav_upper to
WIFI_NAV_UPPER_US (30000) but because of this bug we instead set it to
184 on little endian systems and 0 on big endian ones.

Fixes: 3c05bedb ("Staging: rtl8812ae: Add Realtek 8821 PCI WIFI driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/rtl8821ae/hw.c

@@ -779,7 +779,7 @@ void rtl8821ae_set_hw_reg(struct ieee80211_hw *hw, u8 variable, u8 *val)
 			_rtl8821ae_resume_tx_beacon(hw);
 		break; }
 	case HW_VAR_NAV_UPPER: {
-		u32	us_nav_upper = ((u32)*val);
+		u32	us_nav_upper = *(u32 *)val;
 
 		if (us_nav_upper > HAL_92C_NAV_UPPER_UNIT * 0xFF) {
 			RT_TRACE(rtlpriv, COMP_INIT , DBG_WARNING,