setup: properly detect is_chroot on Btrfs (#55089)

* setup: properly detect is_chroot on Btrfs

Fixes #55006

* Use get_bin_path for stat

* Remove comment

lib/ansible/modules/system/systemd.py

@@ -508,7 +508,7 @@ def main():
                         if rc != 0:
                             module.fail_json(msg="Unable to %s service %s: %s" % (action, unit, err))
             # check for chroot
-            elif is_chroot():
+            elif is_chroot(module):
                 module.warn("Target is a chroot. This can lead to false positives or prevent the init system tools from working.")
             else:
                 # this should not happen?