Update binding.py

Author: kimox2

splunklib/binding.py

@@ -1280,8 +1280,8 @@ def peek(self, size):
 
     def close(self):
         """Closes this response."""
-        if _connection:
-            _connection.close()
+        if self._connection:
+            self._connection.close()
         self._response.close()
 
     def read(self, size = None):