Fix positional FieldData construction

fitparse/records.py

@@ -160,7 +160,7 @@ class FieldData(RecordBase):
     __slots__ = ('field_def', 'field', 'parent_field', 'value', 'raw_value', 'units')
 
     def __init__(self, *args, **kwargs):
-        super().__init__(self, *args, **kwargs)
+        super().__init__(*args, **kwargs)
         if not self.units and self.field:
             # Default to units on field, otherwise None.
             # NOTE:Not a property since you may want to override this in a data processor

tests/test_records.py

@@ -1,10 +1,20 @@
 #!/usr/bin/env python
 
-from fitparse.records import Crc
+from fitparse.records import Crc, FieldData
 
 import unittest
 
 class RecordsTestCase(unittest.TestCase):
+    def test_field_data_accepts_positional_values(self):
+        field_data = FieldData("definition", "field", "parent", "value", "raw", "units")
+
+        self.assertEqual("definition", field_data.field_def)
+        self.assertEqual("field", field_data.field)
+        self.assertEqual("parent", field_data.parent_field)
+        self.assertEqual("value", field_data.value)
+        self.assertEqual("raw", field_data.raw_value)
+        self.assertEqual("units", field_data.units)
+
     def test_crc(self):
         crc = Crc()
         self.assertEqual(0, crc.value)