fix parsing CRC as record

CRC is not part of the data, only look at first 1022 bytes.
Should help fix:
* bewest/decoding-carelink#196


Former-commit-id: 753d8af0f7f3a8f44f8611871b47ce6ec5d8e613
Former-commit-id: e0a780fe0636cdd79ed3a37c17d8a0de11338090 [formerly fa7ab4415f1e748cf72dc402338d40f6b653bee8]
Former-commit-id: 19f2e61a624a9d3f64bf88488c2a49fba04efbec
Former-commit-id: f9111d61da01ed5b88d36728499290ef11648b31

decocare/history.py

@@ -796,7 +796,7 @@ def clean (self, data):
     # data.reverse( )
     # self.data = self.eat_nulls(data)
     #self.data.reverse( )
-    self.data = data[:]
+    self.data = data[0:1022]
     # XXX: under some circumstances, zero is the correct value and
     # eat_nulls actually eats valid data.  This ugly hack restores two
     # nulls back ot the end.