make @foutrelis happy :)

roles/nginx/meta/main.yml

 dependencies:
   - role: geoipupdate
-    when: "'geoip2' in (nginx_extra_modules | map(attribute='name') | list)"
+    when: "'geoip2' in (nginx_extra_modules | map(attribute='name') )"
     vars:
       geoipupdate_edition_ids: GeoLite2-City

roles/nginx/tasks/main.yml

@@ -2,8 +2,7 @@
   pacman: name=nginx,nginx-mod-brotli state=present
 
 - name: Install extra nginx modules
-  pacman: name=nginx-mod-{{ item.name }} state=present
-  loop: "{{ nginx_extra_modules }}"
+  pacman: name={{ nginx_extra_modules | map(attribute='name') | map('regex_replace', '^', 'nginx-mod-') }} state=present
 
 - name: Install nginx.service snippet
   copy: src=nginx.service.d dest=/etc/systemd/system owner=root group=root mode=0644