fix: fixed error System.OverflowException: Array dimensions exceeded supported range.

Author: marcelofontenele

src/NetMQ/Core/Transports/V1Decoder.cs

@@ -124,7 +124,7 @@ private DecodeResult EightByteSizeReady()
             long payloadLength = m_tmpbuf.GetLong(Endian, 0);
 
             // There has to be at least one byte (the flags) in the message).
-            if (payloadLength == 0)
+            if (payloadLength <= 0)
                 return DecodeResult.Error;
 
             // Message size must not exceed the maximum allowed size.