libnetwork: remove ErrDataStoreNotInitialized

If was not used as a sentinel error, so inline the error.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

libnetwork/error.go

@@ -1,7 +1,6 @@
 package libnetwork
 
 import (
-	"errors"
 	"fmt"
 )
 
@@ -108,7 +107,3 @@ func (mr ManagerRedirectError) Error() string {
 
 // Maskable denotes the type of this error
 func (mr ManagerRedirectError) Maskable() {}
-
-// ErrDataStoreNotInitialized is returned if an invalid data scope is passed
-// for getting data store
-var ErrDataStoreNotInitialized = errors.New("datastore is not initialized")

libnetwork/store.go

@@ -157,7 +157,7 @@ func (n *Network) getEndpointsFromStore() ([]*Endpoint, error) {
 func (c *Controller) updateToStore(kvObject datastore.KVObject) error {
 	cs := c.getStore()
 	if cs == nil {
-		return ErrDataStoreNotInitialized
+		return fmt.Errorf("datastore is not initialized")
 	}
 
 	if err := cs.PutObjectAtomic(kvObject); err != nil {
@@ -173,7 +173,7 @@ func (c *Controller) updateToStore(kvObject datastore.KVObject) error {
 func (c *Controller) deleteFromStore(kvObject datastore.KVObject) error {
 	cs := c.getStore()
 	if cs == nil {
-		return ErrDataStoreNotInitialized
+		return fmt.Errorf("datastore is not initialized")
 	}
 
 retry: