Migrate gitea-sdk to v0.12.0 (#133)

Migrate

Update code.gitea.io/sdk/gitea to v0.12.0.

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/133
Reviewed-by: Andrew Thornton <art27@cantab.net>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>

vendor/code.gitea.io/sdk/gitea/repo_tree.go

@@ -31,11 +31,10 @@ type GitTreeResponse struct {
 // GetTrees downloads a file of repository, ref can be branch/tag/commit.
 // e.g.: ref -> master, tree -> macaron.go(no leading slash)
 func (c *Client) GetTrees(user, repo, ref string, recursive bool) (*GitTreeResponse, error) {
-	var trees GitTreeResponse
+	trees := new(GitTreeResponse)
 	var path = fmt.Sprintf("/repos/%s/%s/git/trees/%s", user, repo, ref)
 	if recursive {
 		path += "?recursive=1"
 	}
-	err := c.getParsedResponse("GET", path, nil, nil, &trees)
-	return &trees, err
+	return trees, c.getParsedResponse("GET", path, nil, nil, trees)
 }