fix linter issues

Author: gballet

proof_ipa.go

@@ -433,7 +433,7 @@ func PreStateTreeFromProof(proof *Proof, rootC *Point) (VerkleNode, error) {
 	return root, nil
 }
 
-func PostStateTreeFromProof(preroot VerkleNode, statediff StateDiff, rootC *Point) (VerkleNode, error) {
+func PostStateTreeFromProof(preroot VerkleNode, statediff StateDiff) (VerkleNode, error) {
 	postroot := preroot.Copy()
 	for _, stemstatediff := range statediff {
 		var (
@@ -458,6 +458,7 @@ func PostStateTreeFromProof(preroot VerkleNode, statediff StateDiff, rootC *Poin
 			}
 		}
 	}
+	postroot.Commit()
 
 	return postroot, nil
 }

proof_test.go

@@ -762,6 +762,8 @@ func TestProofVerificationWithPostState(t *testing.T) {
 		},
 	}
 	for _, data := range testlist {
+		data := data // make linter happy by not capturing the loop variable
+
 		t.Run(fmt.Sprintf("verification_with_post_state/%s", data.name), func(t *testing.T) {
 			t.Parallel()