[PATCH] net: mac80211: tx.c: be sure of 'sdata->vif.type' must beNL80211_IFTYPE_AP when be in NL80211_IFTYPE_AP case

[Chen Gang]

In next-20131122 tree, if "sdata->vif.type != NL80211_IFTYPE_AP",
'chanctx_conf' will be not initialized, so need check it. Related
warning (with allmodconfig under hexagon):

    CC [M]  net/mac80211/tx.o
  net/mac80211/tx.c: In function 'ieee80211_subif_start_xmit':
  net/mac80211/tx.c:1827:27: warning: 'chanctx_conf' may be used uninitialized in this function [-Wuninitialized]


Signed-off-by: Chen Gang <gang.chen.5i5j@xxxxxxxxx>
---
 net/mac80211/tx.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index c558b24..f3245d6 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1814,8 +1814,9 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
 			break;
 		/* fall through */
 	case NL80211_IFTYPE_AP:
-		if (sdata->vif.type == NL80211_IFTYPE_AP)
-			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+		if (sdata->vif.type != NL80211_IFTYPE_AP)
+			goto fail_rcu;
+		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 		if (!chanctx_conf)
 			goto fail_rcu;
 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
-- 
1.7.7.6
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