Fix style issue (#2966)

Summary:
Introduced in hotfix https://github.com/pytorch/audio/issues/2964

Pull Request resolved: https://github.com/pytorch/audio/pull/2966

Reviewed By: carolineechen

Differential Revision: D42385913

Pulled By: mthrok

fbshipit-source-id: 6c42dbfbb914b0329c09a1bca591f11cf2e3c1a6

torchaudio/_internal/module_utils.py

@@ -3,8 +3,6 @@ import warnings
 from functools import wraps
 from typing import Optional
 
-import torch
-
 
 def is_module_available(*modules: str) -> bool:
     r"""Returns if a top-level module with :attr:`name` exists *without**