Remove unused buffer

mtglib/internal/tls/conn.go

 
 type connPayload struct {
 	readBuf      bytes.Buffer
-	writeBuf     bytes.Buffer
 	connBuffered *bufio.Reader
 	read         bool
 	write        bool
 	}
 
 	newConn.p.readBuf.Grow(DefaultBufferSize)
-	newConn.p.writeBuf.Grow(DefaultBufferSize)
 
 	return newConn
 }