Cleanup lint errors

balloon/balloon.go

@@ -265,11 +265,13 @@ func (b Balloon) QueryDigestMembership(keyDigest hashing.Digest, version uint64)
 	leaf, err = b.store.Get(storage.IndexPrefix, proof.KeyDigest)
 	switch {
 	case err != nil && err != storage.ErrKeyNotFound:
-		return nil, fmt.Errorf("Error reading leaf %v data: %v", proof.KeyDigest, err)
+		return nil, fmt.Errorf("error reading leaf %v data: %v", proof.KeyDigest, err)
+
 	case err != nil && err == storage.ErrKeyNotFound:
 		proof.Exists = false
 		proof.ActualVersion = version
-		leaf = &storage.KVPair{keyDigest, util.Uint64AsBytes(version)}
+		leaf = &storage.KVPair{Key: keyDigest, Value: util.Uint64AsBytes(version)}
+
 	case err == nil:
 		proof.Exists = true
 		proof.ActualVersion = util.BytesAsUint64(leaf.Value)
@@ -290,11 +292,11 @@ func (b Balloon) QueryDigestMembership(keyDigest hashing.Digest, version uint64)
 
 	wg.Wait()
 	if hyperErr != nil {
-		return nil, fmt.Errorf("Unable to get proof from hyper tree: %v", err)
+		return nil, fmt.Errorf("unable to get proof from hyper tree: %v", err)
 	}
 
 	if historyErr != nil {
-		return nil, fmt.Errorf("Unable to get proof from history tree: %v", err)
+		return nil, fmt.Errorf("unable to get proof from history tree: %v", err)
 	}
 
 	proof.HyperProof = hyperProof
@@ -324,7 +326,7 @@ func (b Balloon) QueryConsistency(start, end uint64) (*IncrementalProof, error)
 
 	historyProof, err := b.historyTree.ProveConsistency(start, end)
 	if err != nil {
-		return nil, fmt.Errorf("Unable to get proof from history tree: %v", err)
+		return nil, fmt.Errorf("unable to get proof from history tree: %v", err)
 	}
 	proof.AuditPath = historyProof.AuditPath