libnmdc: clear fullbuffer prior to connection attempt

src/libnmdc/libnmdc.go

@@ -333,6 +333,8 @@ func (this *HubConnection) worker() {
 		// If we're not connected, attempt reconnect
 		if this.conn == nil {
 
+			fullBuffer = "" // clear
+
 			if this.Hco.Address.IsSecure() {
 				this.conn, err = tls.Dial("tcp", this.Hco.Address.GetHostOnly(), &tls.Config{
 					InsecureSkipVerify: this.Hco.SkipVerifyTLS,