bitswap: remove useless code

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

exchange/bitswap/bitswap.go

@@ -372,16 +372,6 @@ func (bs *Bitswap) ReceiveMessage(ctx context.Context, p peer.ID, incoming bsmsg
 		return
 	}
 
-	// quickly send out cancels, reduces chances of duplicate block receives
-	var keys []*cid.Cid
-	for _, block := range iblocks {
-		if _, found := bs.wm.wl.Contains(block.Cid()); !found {
-			log.Infof("received un-asked-for %s from %s", block, p)
-			continue
-		}
-		keys = append(keys, block.Cid())
-	}
-
 	wg := sync.WaitGroup{}
 	for _, block := range iblocks {
 		wg.Add(1)