iwlagn: fix debug variable access

The compiler correctly warns:
iwl-agn-tx.c: In function ‘iwlagn_tx_status_reply_compressed_ba’:
iwl-agn-tx.c:1240: warning: ‘bitmap’ may be used uninitialized in this function

Move the debug print to the branch that reads the
bitmap, and move the variables too so it's more
obvious where they are needed.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NWey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn-tx.c

@@ -1237,7 +1237,6 @@ static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
 	int i, sh, ack;
 	u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
 	u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
-	u64 bitmap, sent_bitmap;
 	int successes = 0;
 	struct ieee80211_tx_info *info;
 
@@ -1278,6 +1277,8 @@ static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
 		IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
 				ba_resp->txed, ba_resp->txed_2_done);
 	} else {
+		u64 bitmap, sent_bitmap;
+
 		/* don't use 64-bit values for now */
 		bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
 
@@ -1298,7 +1299,11 @@ static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
 			sent_bitmap >>= 1;
 			++i;
 		}
+
+		IWL_DEBUG_TX_REPLY(priv, "Bitmap %llx\n",
+				   (unsigned long long)bitmap);
 	}
+
 	info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
 	memset(&info->status, 0, sizeof(info->status));
 	info->flags |= IEEE80211_TX_STAT_ACK;
@@ -1313,8 +1318,6 @@ static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
 	}
 	iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
 
-	IWL_DEBUG_TX_REPLY(priv, "Bitmap %llx\n", (unsigned long long)bitmap);
-
 	return 0;
 }