rtlwifi: btcoex: fix issue possible condition with no effect (if == else)

fix below issue reported by coccicheck
drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c:514:1-3:
WARNING: possible condition with no effect (if == else)
Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -509,13 +509,7 @@ static u32 halbtc_get_wifi_link_status(struct btc_coexist *btcoexist)
 
 static s32 halbtc_get_wifi_rssi(struct rtl_priv *rtlpriv)
 {
-	int undec_sm_pwdb = 0;
-
-	if (rtlpriv->mac80211.link_state >= MAC80211_LINKED)
-		undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb;
-	else /* associated entry pwdb */
-		undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb;
-	return undec_sm_pwdb;
+	return rtlpriv->dm.undec_sm_pwdb;
 }
 
 static bool halbtc_get(void *void_btcoexist, u8 get_type, void *out_buf)