staging: rtl8723bs: hal: Remove comparison to NULL in rtl8723b_dm.c

Remove comparison to NULL in file rtl8723b_dm.c. Suggested by Coccinelle.
Signed-off-by: Himadri Pandya <himadri18.07@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/hal/rtl8723b_dm.c

@@ -254,7 +254,7 @@ void rtl8723b_HalDmWatchDog_in_LPS(struct adapter *Adapter)
 
       /* 1 Find MIN-RSSI */
 	psta = rtw_get_stainfo(pstapriv, get_bssid(pmlmepriv));
-	if (psta == NULL)
+	if (!psta)
 		goto skip_lps_dm;
 
 	pdmpriv->EntryMinUndecoratedSmoothedPWDB = psta->rssi_stat.UndecoratedSmoothedPWDB;