core: Fix audit log constructor

Fix a regression merged in commit 7bb86ca81ace8960f0d34ab14fe85a93a4541b02.

Change-Id: I9b1b6130bddd380522cbe92287d9d27a2069c7af
Bug-Url: https://bugzilla.redhat.com/1126428
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>