p54: fix broadcast buffering in AP mode

The patch "mac80211: fix PS-poll response race" somehow broke
broadcast buffering in a funny way.

During normal operation - stations are awake - the firmware refused
to transmit broadcast frames and reported P54_TX_PSM_CANCELLED.
But everything worked as soon as one station entered PSM.

The reason:
The stack sets IEEE80211_TX_CTL_SEND_AFTER_DTIM for outgoing
broadcast frames as soon as a station is marked as sleeping.
This flag triggers a path which will reroute these frames
into p54's "content after beacon" queue, which is designed
to cope with the demands for psm.

This patch restores the old behavior.

IEEE80211_TX_CTL_CLEAR_PS_FILT will once again be used to signalize
the firmware to ignore the ps canceling for certain frames.
Signed-off-by: NChristian Lamparter <chunkeey@web.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/p54/txrx.c

@@ -623,6 +623,9 @@ static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
 	if (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)
 		*flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 
+	if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
+		*flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
+
 	*queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
 
 	switch (priv->mode) {