mac80211: fix "‘ret’ may be used uninitialized" warning

net/mac80211/ht.c: In function ‘ieee80211_start_tx_ba_session’:
net/mac80211/ht.c:472: warning: ‘ret’ may be used uninitialized in this function

Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ht.c

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 5f510a1..c5c0c52 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -469,7 +469,7 @@
 	struct ieee80211_sub_if_data *sdata;
 	u16 start_seq_num;
 	u8 *state;
-	int ret;
+	int ret = 0;
 
 	if ((tid >= STA_TID_NUM) || !(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
 		return -EINVAL;