iwlwifi: drop skb silently for Tx request in monitor mode

This patch fixes the problem to keep mac80211 resubmitting SKBs
when Tx request cannot be met in monitor mode.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index 5ed16ce..0bd55bb 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -6237,7 +6237,8 @@
 
 	if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
 		IWL_DEBUG_MAC80211("leave - monitor\n");
-		return -1;
+		dev_kfree_skb_any(skb);
+		return 0;
 	}
 
 	IWL_DEBUG_TX("dev->xmit(%d bytes) at rate 0x%02x\n", skb->len,