wil6210: fix smatch warning in wil_cfg80211_get_station()

Smatch suggests to propagate error code from wil_find_cid(), and, indeed,
it is a good idea.
Signed-off-by: NVladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/cfg80211.c

@@ -181,7 +181,7 @@ static int wil_cfg80211_get_station(struct wiphy *wiphy,
 
 	wil_info(wil, "%s(%pM) CID %d\n", __func__, mac, cid);
 	if (cid < 0)
-		return -ENOENT;
+		return cid;
 
 	rc = wil_cid_fill_sinfo(wil, cid, sinfo);