staging: rtl8723bs: core: rtw_sta_mgt: Return error value directly

Fixes the following W=1 kernel build warning(s):

 drivers/staging/rtl8723bs/core/rtw_sta_mgt.c: In function ‘rtw_init_bcmc_stainfo’:
 drivers/staging/rtl8723bs/core/rtw_sta_mgt.c:512:6: warning: variable ‘res’ set but not used [-Wunused-but-set-variable]

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ross Schmidt <ross.schm.dev@gmail.com>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-18-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_sta_mgt.c

@@ -497,7 +497,6 @@ struct sta_info *rtw_get_stainfo(struct sta_priv *pstapriv, u8 *hwaddr)
 u32 rtw_init_bcmc_stainfo(struct adapter *padapter)
 {
 	struct sta_info *psta;
-	u32 res = _SUCCESS;
 	NDIS_802_11_MAC_ADDRESS	bcast_addr = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 
 	struct	sta_priv *pstapriv = &padapter->stapriv;
@@ -505,15 +504,12 @@ u32 rtw_init_bcmc_stainfo(struct adapter *padapter)
 
 	psta = rtw_alloc_stainfo(pstapriv, bcast_addr);
 
-	if (!psta) {
-		res = _FAIL;
-		goto exit;
-	}
+	if (!psta)
+		return _FAIL;
 
 	/*  default broadcast & multicast use macid 1 */
 	psta->mac_id = 1;
 
-exit:
 	return _SUCCESS;
 }