[devscripts] use boolean conditionals in devscripts tasks

Newer Ansible requires conditionals to resolve to explicit boolean
values rather than relying on truthiness of other types.

132_extend_lvm.yml: replace bare dict checks for ansible_lvm and
root_mount_data with `| length > 0`.

Signed-off-by: John Fulton <fulton@redhat.com>
Assisted-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: fultonj

roles/devscripts/tasks/132_extend_lvm.yml

@@ -43,8 +43,8 @@
     device_name: "{{ root_mount_data['device'] | split('/') | last }}"
     lv_name: "{{ device_name | split('-') | last }}"
   when:
-    - ansible_lvm
-    - root_mount_data
+    - ansible_lvm | length > 0
+    - root_mount_data | length > 0
     - ansible_lvm != 'N/A'
     - "lv_name in ansible_lvm.lvs"
   community.general.lvol: