mac80211: clean up ieee80211_rx_h_check_dup code

Reduce indentation a bit to make the condition more readable.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rx.c

@@ -1113,17 +1113,17 @@ ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
 	    is_multicast_ether_addr(hdr->addr1))
 		return RX_CONTINUE;
 
-	if (rx->sta) {
+	if (!rx->sta)
+		return RX_CONTINUE;
+
 	if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
-			     rx->sta->last_seq_ctrl[rx->seqno_idx] ==
-			     hdr->seq_ctrl)) {
+		     rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
 		I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
 		rx->sta->num_duplicates++;
 		return RX_DROP_UNUSABLE;
 	} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
 		rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
 	}
-	}
 
 	return RX_CONTINUE;
 }