Reflog: correct "new" id for reattaching HEAD

src/refdb_fs.c

@@ -1452,7 +1452,9 @@ static int reflog_append(refdb_fs_backend *backend, const git_reference *ref, co
 	if (error < 0)
 		return error;
 
-	if (git_reference_target(ref) != NULL)
+	if (git_reference_symbolic_target(ref) != NULL)
+		git_reference_name_to_id(&new_id, repo, git_reference_symbolic_target(ref));
+	else if (git_reference_target(ref) != NULL)
 		git_oid_cpy(&new_id, git_reference_target(ref));
 
 	if ((error = serialize_reflog_entry(&buf, &old_id, &new_id, who, message)) < 0)