ath6kl: Return a proper error code when not in connected state

Error code ENOTCONN is more suitable than EINVAL to report
when the driver is not in connected state in ath6kl_wow_suspend().

I found this during code review.

Signed-off-by: Raja Mani <rmani@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/cfg80211.c b/drivers/net/wireless/ath/ath6kl/cfg80211.c
index 1902e2f..5934e40 100644
--- a/drivers/net/wireless/ath/ath6kl/cfg80211.c
+++ b/drivers/net/wireless/ath/ath6kl/cfg80211.c
@@ -1916,7 +1916,7 @@
 		return -EIO;
 
 	if (!test_bit(CONNECTED, &vif->flags))
-		return -EINVAL;
+		return -ENOTCONN;
 
 	if (wow && (wow->n_patterns > WOW_MAX_FILTERS_PER_LIST))
 		return -EINVAL;