[PATCH] hostap: Fix ap_add_sta() return value verification

The Coverity checker (CID: 273) spotted this inconsequent NULL checking
(unconditionally dereferencing directly after checking for NULL
isn't a good idea). Return immediately to avoid this.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/hostap/hostap_ap.c

@@ -3141,7 +3141,7 @@ int hostap_add_sta(struct ap_data *ap, u8 *sta_addr)
 	if (ret == 1) {
 		sta = ap_add_sta(ap, sta_addr);
 		if (!sta)
-			ret = -1;
+			return -1;
 		sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;
 		sta->ap = 1;
 		memset(sta->supported_rates, 0, sizeof(sta->supported_rates));