move when condition in extra vips block validation

moving it to the start of the task for better visibility

roles/validate_inventory/tasks/ai.yml

@@ -30,6 +30,11 @@
   loop: "{{ groups['masters'] + (groups['workers'] | default([])) }}"  # This should not include day2_workers as they can be RWNs
 
 - name: Validate extra VIPs for dualstack
+  when:
+    - extra_api_vip is defined
+    - extra_api_vip | length > 0
+    - extra_ingress_vip is defined
+    - extra_ingress_vip | length > 0
   block:
     - name: Assert that Openshift version is supported for dualstack VIPs
       assert:
@@ -56,8 +61,3 @@
         - vip_dhcp_allocation == false
         - extra_machine_networks is defined
       loop: "{{ hostvars['assisted_installer']['extra_machine_networks'] }}"
-  when:
-    - extra_api_vip is defined
-    - extra_api_vip | length > 0
-    - extra_ingress_vip is defined
-    - extra_ingress_vip | length > 0