core/state, trie: remove unused error-return from trie Commit operation (#26641)

core/state/database.go

@@ -109,7 +109,7 @@ type Trie interface {
 	// The returned nodeset can be nil if the trie is clean(nothing to commit).
 	// Once the trie is committed, it's not usable anymore. A new trie must
 	// be created with new root and updated trie database for following usage
-	Commit(collectLeaf bool) (common.Hash, *trie.NodeSet, error)
+	Commit(collectLeaf bool) (common.Hash, *trie.NodeSet)
 
 	// NodeIterator returns an iterator that returns nodes of the trie. Iteration
 	// starts at the key after the given start key.

core/state/snapshot/generate.go

@@ -367,8 +367,8 @@ func (dl *diskLayer) generateRange(ctx *generatorContext, trieId *trie.ID, prefi
 		for i, key := range result.keys {
 			snapTrie.Update(key, result.vals[i])
 		}
-		root, nodes, err := snapTrie.Commit(false)
-		if err == nil && nodes != nil {
+		root, nodes := snapTrie.Commit(false)
+		if nodes != nil {
 			tdb.Update(trie.NewWithNodeSet(nodes))
 			tdb.Commit(root, false)
 		}

core/state/snapshot/generate_test.go

@@ -190,7 +190,7 @@ func (t *testHelper) makeStorageTrie(stateRoot, owner common.Hash, keys []string
 	if !commit {
 		return stTrie.Hash().Bytes()
 	}
-	root, nodes, _ := stTrie.Commit(false)
+	root, nodes := stTrie.Commit(false)
 	if nodes != nil {
 		t.nodes.Merge(nodes)
 	}
@@ -198,7 +198,7 @@ func (t *testHelper) makeStorageTrie(stateRoot, owner common.Hash, keys []string
 }
 
 func (t *testHelper) Commit() common.Hash {
-	root, nodes, _ := t.accTrie.Commit(true)
+	root, nodes := t.accTrie.Commit(true)
 	if nodes != nil {
 		t.nodes.Merge(nodes)
 	}

core/state/state_object.go

@@ -385,10 +385,8 @@ func (s *stateObject) commitTrie(db Database) (*trie.NodeSet, error) {
 	if metrics.EnabledExpensive {
 		defer func(start time.Time) { s.db.StorageCommits += time.Since(start) }(time.Now())
 	}
-	root, nodes, err := tr.Commit(false)
-	if err == nil {
-		s.data.Root = root
-	}
+	root, nodes := tr.Commit(false)
+	s.data.Root = root
 	return nodes, err
 }
 

core/state/statedb.go

@@ -1019,10 +1019,7 @@ func (s *StateDB) Commit(deleteEmptyObjects bool) (common.Hash, error) {
 	if metrics.EnabledExpensive {
 		start = time.Now()
 	}
-	root, set, err := s.trie.Commit(true)
-	if err != nil {
-		return common.Hash{}, err
-	}
+	root, set := s.trie.Commit(true)
 	// Merge the dirty nodes of account trie into global set
 	if set != nil {
 		if err := nodes.Merge(set); err != nil {