trust: Don't use invalid public keys for looking up stapled extensions
trust: Don't use invalid public keys for looking up stapled extensions

https://bugs.freedesktop.org/show_bug.cgi?id=82328

freedesktop-unofficial-mirror/p11-glue__p11-kit,lkundrak/p11-kit,freedesktop-unofficial-mirror/p11-glue__p11-kit,freedesktop-unofficial-mirror/p11-glue__p11-kit,pspacek/p11-kit,pspacek/p11-kit,lkundrak/p11-kit,pspacek/p11-kit,lkundrak/p11-kit,pspacek/p11-kit