openpgp: Make ValidCert::primary_key infallible.

  - A `ValidCert` always has a `ValidPrimaryKeyAmalgamation`.

1 files changed, 2 insertions, 1 deletions

diff --git a/openpgp/src/cert/mod.rs b/openpgp/src/cert/mod.rs
index a0fb5ab5..8be42fb2 100644
--- a/openpgp/src/cert/mod.rs
+++ b/openpgp/src/cert/mod.rs
@@ -1429,9 +1429,10 @@ impl<'a> ValidCert<'a> {
 
     /// Returns the amalgamated primary key.
     pub fn primary_key(&self)
-        -> Result<ValidPrimaryKeyAmalgamation<key::PublicParts>>
+        -> ValidPrimaryKeyAmalgamation<key::PublicParts>
     {
         self.cert.primary_key().with_policy(self.policy, self.time)
+            .expect("A ValidKeyAmalgamation must have a ValidPrimaryKeyAmalgamation")
     }
 
     /// Returns an iterator over the certificate's keys.