linting: fixup some stuffs

keys/cryptostore/holder.go

@@ -24,14 +24,15 @@ func New(coder Encoder, store keys.Storage, codec keys.Codec) Manager {
 	}
 }
 
+var _ keys.Signer = Manager{}
+var _ keys.Manager = Manager{}
+
 // exists just to make sure we fulfill the Signer interface
-// nolint [ megacheck, deadcode ]
 func (s Manager) assertSigner() keys.Signer {
 	return s
 }
 
 // exists just to make sure we fulfill the Manager interface
-// nolint [ megacheck, deadcode ]
 func (s Manager) assertKeyManager() keys.Manager {
 	return s
 }

keys/cryptostore/holder_test.go

@@ -144,7 +144,6 @@ func TestKeyManagement(t *testing.T) {
 // 	}
 // }
 
-// nolint: unparam
 func assertPassword(assert *assert.Assertions, cstore cryptostore.Manager, name, pass, badpass string) {
 	err := cstore.Update(name, badpass, pass)
 	assert.NotNil(err)