rtlwifi: btcoexist: adjust double test

Rewrite a duplicated test to test the correct value

The Coccinelle semantic patch that finds this problem is:

// <smpl>
@@
expression E;
@@

(
* E
  || ... || E
|
* E
  && ... && E
)
// </smpl>
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Larry.Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/btcoexist/halbtcoutsrc.c

@@ -101,7 +101,7 @@ static bool halbtc_legacy(struct rtl_priv *adapter)
 
 	bool is_legacy = false;
 
-	if ((mac->mode == WIRELESS_MODE_B) || (mac->mode == WIRELESS_MODE_B))
+	if ((mac->mode == WIRELESS_MODE_B) || (mac->mode == WIRELESS_MODE_G))
 		is_legacy = true;
 
 	return is_legacy;