Fix pandas-dev#36791 and pandas-dev#34548 correctly respecting read_json chunksize.

Author: robertwb

pandas/io/json/_json.py

@@ -625,7 +625,7 @@ def _preprocess_data(self, data):
         If self.chunksize, we prepare the data for the `__next__` method.
         Otherwise, we read it into memory for the `read` method.
         """
-        if hasattr(data, "read") and (not self.chunksize or not self.nrows):
+        if hasattr(data, "read") and not (self.chunksize or self.nrows):
             data = data.read()
             self.close()
         if not hasattr(data, "read") and (self.chunksize or self.nrows):