xml: ensure the stream object is closed in main() (#9695)

* ensure the stream object is closed in main()

* add changelog frag

* Update plugins/modules/xml.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/modules/xml.py

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/9695-xml-close-file.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - xml - ensure file descriptor is closed (https://github.com/ansible-collections/community.general/pull/9695).

plugins/modules/xml.py

@@ -920,6 +920,8 @@ def main():
     elif LooseVersion('.'.join(to_native(f) for f in etree.LXML_VERSION)) < LooseVersion('3.0.0'):
         module.warn('Using lxml version lower than 3.0.0 does not guarantee predictable element attribute order.')
 
+    infile = None
+    try:
         # Check if the file exists
         if xml_string:
             infile = BytesIO(to_bytes(xml_string, errors='surrogate_or_strict'))
@@ -943,6 +945,9 @@ def main():
             doc = etree.parse(infile, parser)
         except etree.XMLSyntaxError as e:
             module.fail_json(msg="Error while parsing document: %s (%s)" % (xml_file or 'xml_string', e))
+    finally:
+        if infile:
+            infile.close()
 
     # Ensure we have the original copy to compare
     global orig_doc