certificate: Fix uninitialized member
certificate: Fix uninitialized member

Change-Id: Iedf125f04c86ba0981693d6592ce91ccf7e00f88
Reviewed-by: Nicolas Jäger <0cb6976f4960cd47d671d91396dc19be062446b8@savoirfairelinux.com>

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc