hostname module - fix TypeError in FileStrategy (#77025) (#77074)

* Use file_get_content() to read the file containing the host name

changelogs/fragments/77074-hostname-fix-typeerror-in-filestrategy.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - hostname - use ``file_get_content()`` to read the file containing the host name in the ``FileStrategy.get_permanent_hostname()`` method. This prevents a ``TypeError`` from being raised when the strategy is used (https://github.com/ansible/ansible/issues/77025).

lib/ansible/modules/hostname.py

@@ -257,7 +257,7 @@ class FileStrategy(BaseStrategy):
             return ''
 
         try:
-            return get_file_lines(self.FILE)
+            return get_file_content(self.FILE, default='', strip=True)
         except Exception as e:
             self.module.fail_json(
                 msg="failed to read hostname: %s" % to_native(e),