[libgpiod][PATCH v2] bindings: python: allow closing a Chip multiple times

[Vincent Fazio <vfazio@gmail.com>]

In Python, it is common for objects to allow their `close` method to be
executed multiple times out of convenience. An example of this is the
`IOBase` class [0] which is the base class of most file-like classes.

Update `Chip.close` to follow this example.

[0]: https://docs.python.org/release/3.10.0/library/io.html#io.IOBase.close

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
---
 bindings/python/gpiod/chip.py       | 6 +++---
 bindings/python/tests/tests_chip.py | 8 --------
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/bindings/python/gpiod/chip.py b/bindings/python/gpiod/chip.py
index 8113fa9..6b7b32b 100644
--- a/bindings/python/gpiod/chip.py
+++ b/bindings/python/gpiod/chip.py
@@ -99,9 +99,9 @@ class Chip:
         Close the associated GPIO chip descriptor. The chip object must no
         longer be used after this method is called.
         """
-        self._check_closed()
-        cast("_ext.Chip", self._chip).close()
-        self._chip = None
+        if self._chip is not None:
+            self._chip.close()
+            self._chip = None
 
     def get_info(self) -> ChipInfo:
         """
diff --git a/bindings/python/tests/tests_chip.py b/bindings/python/tests/tests_chip.py
index d5a64b3..9007885 100644
--- a/bindings/python/tests/tests_chip.py
+++ b/bindings/python/tests/tests_chip.py
@@ -184,14 +184,6 @@ class ClosedChipCannotBeUsed(TestCase):
             with chip:
                 _ = chip.fd
 
-    def test_close_chip_twice(self) -> None:
-        sim = gpiosim.Chip(label="foobar")
-        chip = gpiod.Chip(sim.dev_path)
-        chip.close()
-
-        with self.assertRaises(gpiod.ChipClosedError):
-            chip.close()
-
 
 class StringRepresentation(TestCase):
     def setUp(self) -> None:
-- 
2.43.0