Reduce length by 1 if there is a trailing zero at the end

squinnondation/messages.py

@@ -285,6 +285,7 @@ class DataTLV(TLV):
         self.data = raw_data[14:len(self)]
         if self.data[-1] == 0:
             self.data = self.data[:-1]
+            self.length -= 1
 
     def marshal(self) -> bytes:
         return self.type.to_bytes(1, sys.byteorder) + \