squash: pytables.py: remove one assignment

Author: jgehrcke

pandas/io/pytables.py

@@ -1832,8 +1832,8 @@ def convert(self, values, nan_rep, encoding, errors, start=None,
         """
 
         start = start if start is not None else 0
-        stop = stop if stop is not None else self.table.nrows
-        stop = min(stop, self.table.nrows)
+        stop = min(stop, self.table.nrows) \
+            if stop is not None else self.table.nrows
         self.values = Int64Index(np.arange(stop - start))
 
         return self