Fix ansible-lint warnings

Change-Id: I4980b5577984f673eec23ce9a07fccf26fbcd875
diff --git a/playbooks/roles/prepare-libvirt/tasks/main.yml b/playbooks/roles/prepare-libvirt/tasks/main.yml
index 203675d..593613b 100644
--- a/playbooks/roles/prepare-libvirt/tasks/main.yml
+++ b/playbooks/roles/prepare-libvirt/tasks/main.yml
@@ -61,9 +61,9 @@
 
 - name: "Place sgabios.bin"
   command: cp /usr/share/misc/sgabios.bin /usr/share/qemu/sgabios.bin
-  when: >
-    test_sgabios_qemu == false and
-    test_sgabios_misc == true
+  when:
+    - not test_sgabios_qemu
+    - test_sgabios_misc
 
 # NOTE(TheJulia): In order to prevent conflicts, stop
 # dnsmasq to prevent conflicts with libvirt restarting.