Wrong variable name.

defaults/main.yml

@@ -133,7 +133,7 @@ nfs_server_ganesha_exports: []
 
 # tmpreaper
 tmpreaper_install: false
-mpreaper_use_ctime: true
+tmpreaper_use_ctime: true
 tmpreaper_protect_extra: ''
 tmpreaper_dirs: '/tmp/.'
 tmpreaper_extra_dirs: ''

tasks/tmpreaper.yml

@@ -13,7 +13,7 @@
       path: /etc/cron.daily/tmpreaper
       regexp: "^  --ctime \\"
       line: "  --mtime \\"
-    when: not mpreaper_use_ctime
+    when: not tmpreaper_use_ctime
 
   - name: Install the tmpreaper configuration
     ansible.builtin.template: src=tmpreaper.conf.j2 dest=/etc/tmpreaper.conf owner=root group=root mode=0444