sap_hana_install: Fix internal variable name

Signed-off-by: Bernd Finger <bfinger@redhat.com>

Author: berndfinger

roles/sap_hana_install/tasks/post_tasks/fapolicyd.yml

@@ -62,11 +62,11 @@
     # Reason for noqa: The return code of the command is always 0 no matter if there was a change or not
     - name: SAP HANA - Post-Tasks - Merge rule files # noqa no-changed-when
       ansible.builtin.command: fagenrules --load
-      register: sap_hana_install_register_fagenrules_load
+      register: __sap_hana_install_register_fagenrules_load
 
     - name: SAP HANA - Post-Tasks - Display the output of the command 'fagenrules --load'
       ansible.builtin.debug:
-        msg: "{{ sap_hana_install_register_fagenrules_load.stdout_lines }}"
+        msg: "{{ __sap_hana_install_register_fagenrules_load.stdout_lines }}"
 
     # We want to add files which have the execute mode bit set AND which are reported as executables
     # by fapolicyd-cli -t, one for each directory of sap_hana_install_directories.