all: get rid of error when creating memory database (#16716)

* all: get rid of error when create mdb

* core: clean up variables definition

* all: inline mdb definition

1 files changed, 1 insertions, 1 deletions

diff --git a/node/node.go b/node/node.go
index 83b6c4c07..c4368189f 100644
--- a/node/node.go
+++ b/node/node.go
@@ -568,7 +568,7 @@ func (n *Node) EventMux() *event.TypeMux {
 // ephemeral, a memory database is returned.
 func (n *Node) OpenDatabase(name string, cache, handles int) (ethdb.Database, error) {
 	if n.config.DataDir == "" {
-		return ethdb.NewMemDatabase()
+		return ethdb.NewMemDatabase(), nil
 	}
 	return ethdb.NewLDBDatabase(n.config.resolvePath(name), cache, handles)
 }