wifi: wilc1000: set station_info flag only when signal value is valid

Set station_info->filled to indicate signal level only when its value is
received successfully using wilc_get_rssi().
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220720160302.231516-4-ajay.kathat@microchip.com

drivers/net/wireless/microchip/wilc1000/cfg80211.c

@@ -1312,12 +1312,11 @@ static int dump_station(struct wiphy *wiphy, struct net_device *dev,
 	if (idx != 0)
 		return -ENOENT;
 
-	sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
-
 	ret = wilc_get_rssi(vif, &sinfo->signal);
 	if (ret)
 		return ret;
 
+	sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
 	memcpy(mac, vif->priv.associated_bss, ETH_ALEN);
 	return 0;
 }