Re: [PATCH v2 1/2] rust: task: use `as_char_ptr` instead of `as_ptr().cast()`

[kernel test robot]

Hi Gary,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 053966c344dbd346e71305f530e91ea77916189f]

url:    https://github.com/intel-lab-lkp/linux/commits/Gary-Guo/rust-disallow-use-of-CStr-as_ptr/20260122-224657
base:   053966c344dbd346e71305f530e91ea77916189f
patch link:    https://lore.kernel.org/r/20260122144444.265412-1-gary%40kernel.org
patch subject: [PATCH v2 1/2] rust: task: use `as_char_ptr` instead of `as_ptr().cast()`
config: x86_64-buildonly-randconfig-004-20260125 (https://download.01.org/0day-ci/archive/20260125/202601250701.wXxtGd9z-lkp@xxxxxxxxx/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260125/202601250701.wXxtGd9z-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601250701.wXxtGd9z-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> warning: unused import: `str::CStrExt`
   --> rust/kernel/task.rs:12:5
   |
   12 |     str::CStrExt,
   |     ^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

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