THRIFT-5007 Implement MAX_MESSAGE_SIZE and remaining read bytes control
Client: Delphi
Patch: Jens Geyer

This closes #1932
diff --git a/lib/delphi/src/Thrift.Processor.Multiplex.pas b/lib/delphi/src/Thrift.Processor.Multiplex.pas
index 622f730..ba77d94 100644
--- a/lib/delphi/src/Thrift.Processor.Multiplex.pas
+++ b/lib/delphi/src/Thrift.Processor.Multiplex.pas
@@ -132,6 +132,7 @@
 
 function TMultiplexedProcessorImpl.TStoredMessageProtocol.ReadMessageBegin: TThriftMessage;
 begin
+  Reset;
   result := FMessageBegin;
 end;