[asahilinux:bits/250-aop 101/112] warning: comparing with null is better expressed by the `.is_null()` method

[asahilinux:bits/250-aop 101/112] warning: comparing with null is better expressed by the `.is_null()` method

[kernel test robot]

tree:   https://github.com/AsahiLinux/linux bits/250-aop
head:   fd3792ec2053672fb9359a570552a51ae48f4035
commit: 6303e0f5115807296306000e29cc91ac57587573 [101/112] rust: device: Add Device::parent()
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250210/202502101942.fQbu6R2C-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250210/202502101942.fQbu6R2C-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/202502101942.fQbu6R2C-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> warning: comparing with null is better expressed by the `.is_null()` method
   --> rust/kernel/device.rs:71:12
   |
   71 |         if pdev == ptr::null_mut() {
   |            ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_null
   = note: `-W clippy::cmp-null` implied by `-W clippy::all`
   = help: to override `-W clippy::all` add `#[allow(clippy::cmp_null)]`

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki