rtlwifi: rtl8192cu: Add missing case in rtl92cu_get_hw_reg

Driver was reporting 'switch case not processed' after association,
so HW_VAR_KEEP_ALIVE was added and filled similarily to other drivers.

Positive side effect to this seems to be a bit more stable connection.
Signed-off-by: Priit Laes <plaes@plaes.org>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c

@@ -1946,6 +1946,14 @@ void rtl92cu_set_hw_reg(struct ieee80211_hw *hw, u8 variable, u8 *val)
 		rtl_write_word(rtlpriv, REG_RXFLTMAP2, *(u16 *)val);
 		mac->rx_data_filter = *(u16 *)val;
 		break;
+	case HW_VAR_KEEP_ALIVE:{
+			u8 array[2];
+			array[0] = 0xff;
+			array[1] = *((u8 *)val);
+			rtl92c_fill_h2c_cmd(hw, H2C_92C_KEEP_ALIVE_CTRL, 2,
+					    array);
+			break;
+		}
 	default:
 		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
 			 "switch case not processed\n");