Ensure proper quoting of var

tasks/main.yml

@@ -16,7 +16,7 @@
   package:
     name: "{{ item }}"
     state: absent
-  with_items: shorewall_incompatible_packages
+  with_items: "{{ shorewall_incompatible_packages }}"
   when: (shorewall_package_state != "absent")
 
 - include: shorewall.yml

tasks/shorewall6.yml

@@ -9,7 +9,7 @@
   package:
     name: "{{ item }}"    
     state: "{{ shorewall6_package_state }}"
-  with_items: shorewall6_packages    
+  with_items: "{{ shorewall6_packages }}"
   notify: 
     - enable shorewall6
   tags: