Fix issues identified by golint

config.go

@@ -1,5 +1,6 @@
 package keyring
 
+// Config contains configuration for keyring
 type Config struct {
 	// AllowedBackends is a whitelist of backend providers that can be used. Nil means all available.
 	AllowedBackends []BackendType

keychain.go

@@ -209,10 +209,10 @@ func (k *keychain) createOrOpen() (gokeychain.Keychain, error) {
 	if err == nil {
 		debugf("Keychain status returned nil, keychain exists")
 		return kc, nil
-	} else {
-		debugf("Keychain status returned error: %v", err)
 	}
 
+	debugf("Keychain status returned error: %v", err)
+
 	if err != gokeychain.ErrorNoSuchKeychain {
 		return gokeychain.Keychain{}, err
 	}

keyring.go

@@ -8,6 +8,9 @@ import (
 	"log"
 )
 
+// A BackendType is an identifier for a credential storage service
+type BackendType string
+
 // All currently supported secure storage backends
 const (
 	InvalidBackend       BackendType = "invalid"
@@ -34,8 +37,6 @@ var backendOrder = []BackendType{
 	FileBackend,
 }
 
-type BackendType string
-
 var supportedBackends = map[BackendType]opener{}
 
 // AvailableBackends provides a slice of all available backend keys on the current OS
@@ -99,10 +100,10 @@ type Keyring interface {
 var ErrNoAvailImpl = errors.New("Specified keyring backend not available")
 
 // ErrKeyNotFound is returned by Keyring Get when the item is not on the keyring
-var ErrKeyNotFound = errors.New("The specified item could not be found in the keyring.")
+var ErrKeyNotFound = errors.New("The specified item could not be found in the keyring")
 
 var (
-	// Whether to print debugging output
+	// Debug specifies whether to print debugging output
 	Debug bool
 )
 

prompt.go

@@ -7,6 +7,7 @@ import (
 	"golang.org/x/crypto/ssh/terminal"
 )
 
+// PromptFunc is a function used to prompt the user for a password
 type PromptFunc func(string) (string, error)
 
 func terminalPrompt(prompt string) (string, error) {