p54: move p54_vdcf_init to the right place.

priv->tx_hdr_len is set by the driver _after_ it called p54_init_common.
While this isn't much a problem for any PCI or ISL3887 cards/sticks,
because they don't need any extra header and therefore tx_hdr_len is
zero for them...
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/p54/p54common.c

@@ -837,10 +837,21 @@ static int p54_start(struct ieee80211_hw *dev)
 	struct p54_common *priv = dev->priv;
 	int err;
 
+	if (!priv->cached_vdcf) {
+		priv->cached_vdcf = kzalloc(sizeof(struct p54_tx_control_vdcf)+
+			priv->tx_hdr_len + sizeof(struct p54_control_hdr),
+			GFP_KERNEL);
+
+		if (!priv->cached_vdcf)
+			return -ENOMEM;
+	}
+
 	err = priv->open(dev);
 	if (!err)
 		priv->mode = IEEE80211_IF_TYPE_MNTR;
 
+	p54_init_vdcf(dev);
+
 	return err;
 }
 
@@ -1020,15 +1031,6 @@ struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 	dev->extra_tx_headroom = sizeof(struct p54_control_hdr) + 4 +
 				 sizeof(struct p54_tx_control_allocdata);
 
-        priv->cached_vdcf = kzalloc(sizeof(struct p54_tx_control_vdcf) +
-              priv->tx_hdr_len + sizeof(struct p54_control_hdr), GFP_KERNEL);
-
-	if (!priv->cached_vdcf) {
-		ieee80211_free_hw(dev);
-		return NULL;
-	}
-
-	p54_init_vdcf(dev);
 	mutex_init(&priv->conf_mutex);
 
 	return dev;