Fixed miner and logger

ethlog/loggers.go

@@ -96,7 +96,7 @@ func AddLogSystem(logSystem LogSystem) {
 	mutex.Lock()
 	defer mutex.Unlock()
 	if logSystems == nil {
-		logMessages = make(chan *logMessage)
+		logMessages = make(chan *logMessage, 10)
 		quit = make(chan bool, 1)
 		go start()
 	}

ethminer/miner.go

@@ -135,10 +135,9 @@ out:
 
 func (self *Miner) Stop() {
 	logger.Infoln("Stopping...")
-	self.quitChan <- true
 
-	close(self.powQuitChan)
-	close(self.quitChan)
+	self.quitChan <- true
+	self.powQuitChan <- ethutil.React{}
 
 	self.ethereum.Reactor().Post("miner:stop", self)
 }