rust: task: use `as_char_ptr` instead of `as_ptr().cast()`

`as_char_ptr` would provide the correct (unsigned char) type without
needing to convert to an intermediate type and cast the pointer.

The `as_ptr()` function is going to be disallowed by clippy warning, so fix
this usage.

This is used only if CONFIG_DEBUG_ATOMIC_SLEEP=y. Instead of conditionally
importing `CStrExt`, import it via prelude instead, and remove other
imports that are already available via the prelude.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202601221157.89t3Sqbl-lkp@intel.com/
Signed-off-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260203130745.868762-1-gary@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

0 files changed, 0 insertions, 0 deletions