add an extra check to dequeue explicit requests in range requester

Author: mafintosh

lib/replicator.js

@@ -726,6 +726,10 @@ class Peer {
       b.inflight.push(req)
       this._send(req)
 
+      // Don't think this will ever happen, as the pending queue is drained before the range queue
+      // but doesn't hurt to check this explicitly here also.
+      if (b.queued) b.queued = false
+
       return true
     }