services/wiki: Close() after error handling (#27129)

Refs: https://codeberg.org/forgejo/forgejo/pulls/1385

Signed-off-by: Lars Lehtonen <lars.lehtonen@gmail.com>
(cherry picked from commit 589e7d346f51de4a0e2c461b220c8cad34133b2f)

Co-authored-by: Lars Lehtonen <lars.lehtonen@gmail.com>

services/wiki/wiki_test.go

@@ -251,8 +251,8 @@ func TestPrepareWikiFileName(t *testing.T) {
 	unittest.PrepareTestEnv(t)
 	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
 	gitRepo, err := git.OpenRepository(git.DefaultContext, repo.WikiPath())
-	defer gitRepo.Close()
 	assert.NoError(t, err)
+	defer gitRepo.Close()
 
 	tests := []struct {
 		name      string
@@ -303,8 +303,8 @@ func TestPrepareWikiFileName_FirstPage(t *testing.T) {
 	assert.NoError(t, err)
 
 	gitRepo, err := git.OpenRepository(git.DefaultContext, tmpDir)
-	defer gitRepo.Close()
 	assert.NoError(t, err)
+	defer gitRepo.Close()
 
 	existence, newWikiPath, err := prepareGitPath(gitRepo, "Home")
 	assert.False(t, existence)