[rust:pr/1161 185/195] warning: unneeded unit return type

[rust:pr/1161 185/195] warning: unneeded unit return type

[kernel test robot]

tree:   https://github.com/Rust-for-Linux/linux pr/1161
head:   9f5fa1ba161d636d346f72ba808ce20ee4a3fa70
commit: aac1a5b385f3ce34533b9afafb8614572d3f0d2d [185/195] feat: crash when receiving packet
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250430/202504300358.x1HTowZ2-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
rustc: rustc 1.78.0 (9b00956e5 2024-04-29)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250430/202504300358.x1HTowZ2-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/202504300358.x1HTowZ2-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> warning: unneeded unit return type
   --> rust/kernel/net/dev.rs:520:37
   |
   520 |     pub fn ip_summed(&self, val: u8) -> () {
   |                                     ^^^^^^ help: remove the `-> ()`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
   = note: `-W clippy::unused-unit` implied by `-W clippy::all`
   = help: to override `-W clippy::all` add `#[allow(clippy::unused_unit)]`
--
>> warning: unneeded unit return type
   --> rust/kernel/net/dev.rs:527:37
   |
   527 |     pub fn protocol(&self, val: u16) -> () {
   |                                     ^^^^^^ help: remove the `-> ()`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit

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