iwlagn: remove powersave warning

Through races, a packet may be enqueued for
transmission to a station while that station
is going to sleep, in which case the warning
here triggers. Instead of warning, check the
condition -- if this packet is not a PS-poll
response then we still enqueue it but it will
be rejected by the device since the station
is marked as asleep.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn-tx.c

@@ -567,8 +567,8 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 	if (sta)
 		sta_priv = (void *)sta->drv_priv;
 
-	if (sta_priv && sta_priv->asleep) {
-		WARN_ON(!(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE));
+	if (sta_priv && sta_priv->asleep &&
+	    (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
 		/*
 		 * This sends an asynchronous command to the device,
 		 * but we can rely on it being processed before the