fix variable assigned and not used.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

models/repo.go

 		repoPath, fmt.Sprintf("ForkRepository(git update-server-info): %s", repoPath),
 		"git", "update-server-info")
 	if err != nil {
-		return nil, fmt.Errorf("git update-server-info: %v", err)
+		return nil, fmt.Errorf("git update-server-info: %v", stderr)
 	}
 
 	if err = createUpdateHook(repoPath); err != nil {

modules/context/repo.go

 
 		userName := ctx.Params(":username")
 		repoName := ctx.Params(":reponame")
-		refName := ctx.Params(":branchname")
-		if len(refName) == 0 {
-			refName = ctx.Params(":path")
-		}
 
 		// Check if the user is the same as the repository owner
 		if ctx.IsSigned && ctx.User.LowerName == strings.ToLower(userName) {