code_size_compare: make sure _remove_worktree executed

Add try and finally to make sure we remove worktree as expected even
if we hit errors by accident.

Signed-off-by: Yanray Wang <yanray.wang@arm.com>

scripts/code_size_compare.py

@@ -423,8 +423,10 @@ class CodeSizeCalculator:
         """
 
         git_worktree_path = self._create_git_worktree()
+        try:
             self._build_libraries(git_worktree_path)
             res = self._gen_raw_code_size(git_worktree_path)
+        finally:
             self._remove_worktree(git_worktree_path)
 
         return res