iwlwifi: testing the wrong variable in iwl_add_bssid_station()

The intent here is to test that "sta_id_r" is a valid pointer.  We do
this same test later on in the function.

Btw iwl_add_bssid_station() is called from two places and "sta_id_r" is
a valid pointer from both callers.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-sta.c

@@ -431,7 +431,7 @@ int iwl_add_bssid_station(struct iwl_priv *priv, const u8 *addr, bool init_rs,
 	struct iwl_link_quality_cmd *link_cmd;
 	unsigned long flags;
 
-	if (*sta_id_r)
+	if (sta_id_r)
 		*sta_id_r = IWL_INVALID_STATION;
 
 	ret = iwl_add_station_common(priv, addr, 0, NULL, &sta_id);