common.py: Change 'device-tree' repo update process used for TC5 images

In update_dt_git_repo(), the code was incorrectly passing a GitPython
Head object as the refspec argument in the Remote.fetch() method, which
should be a string or list of strings.

Newer versions of GitPython added a check that verifies if refspec is of
the expected type, throwing an error if that isn't the case. Because of
this the 'dt checkout --update' command fails if TCB was built with recent
versions of the GitPython library.

This commit removes the unnecessary refspec argument.

Signed-off-by: Lucas Akira Morishita <[email protected]>

tcbuilder/backend/common.py

@@ -437,7 +437,7 @@ def update_dt_git_repo():
     try:
         repo_obj = git.Repo(os.path.abspath("device-trees"))
         sha = repo_obj.head.object.hexsha
-        repo_obj.remotes["origin"].fetch(repo_obj.active_branch)
+        repo_obj.remotes["origin"].fetch()
         repo_obj.remotes["origin"].pull()
         set_output_ownership("device-trees")
         log.info("'device-trees' is already up to date"