Re: [PATCH v18 16/16] rust: replace `CStr` with `core::ffi::CStr`

[kernel test robot <lkp@intel.com>]

Hi Alice,

kernel test robot noticed the following build errors:

[auto build test ERROR on 6f3b6e91f7201e248d83232538db14d30100e9c7]

url:    https://github.com/intel-lab-lkp/linux/commits/Tamir-Duberstein/samples-rust-platform-remove-trailing-commas/20251019-060517
base:   6f3b6e91f7201e248d83232538db14d30100e9c7
patch link:    https://lore.kernel.org/r/20251018180552.3616793-1-aliceryhl%40google.com
patch subject: [PATCH v18 16/16] rust: replace `CStr` with `core::ffi::CStr`
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20251020/202510201014.KMYY9XHs-lkp@intel.com/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/20251020/202510201014.KMYY9XHs-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510201014.KMYY9XHs-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0599]: no method named `as_bytes` found for struct `CString` in the current scope
   --> samples/rust/rust_debugfs_scoped.rs:41:38
   |
   41 |         .retain(|device| device.name.as_bytes() != to_remove.as_bytes());
   |                                      ^^^^^^^^
   |
   help: there is a method `to_bytes` with a similar name
   |
   41 -         .retain(|device| device.name.as_bytes() != to_remove.as_bytes());
   41 +         .retain(|device| device.name.to_bytes() != to_remove.as_bytes());
   |
--
>> error[E0599]: no method named `as_bytes` found for reference `&core::ffi::CStr` in the current scope
   --> samples/rust/rust_debugfs_scoped.rs:41:62
   |
   41 |         .retain(|device| device.name.as_bytes() != to_remove.as_bytes());
   |                                                              ^^^^^^^^
   |
   help: there is a method `to_bytes` with a similar name
   |
   41 -         .retain(|device| device.name.as_bytes() != to_remove.as_bytes());
   41 +         .retain(|device| device.name.as_bytes() != to_remove.to_bytes());
   |

-- 
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