semicolon_if_nothing_returned breaks `unsafe { nullpointer }`

Using the following flags

--force-warn clippy::semicolon-if-nothing-returned

this code:

use std::ptr;

fn main() {
    let a_billion_dollar_mistake = ptr::null();

    unsafe {
        *a_billion_dollar_mistake
    }
}

caused the following diagnostics:

    Checking _main v0.1.0 (/tmp/icemaker_global_tempdir.DOE7jUlq8RhE/icemaker_clippyfix_tempdir.tfQ4LVtK96ol/_main)
warning: consider adding a `;` to the last statement for consistent formatting
 --> src/main.rs:7:9
  |
7 |         *a_billion_dollar_mistake
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: add a `;` here: `*a_billion_dollar_mistake;`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#semicolon_if_nothing_returned
  = note: requested on the command line with `--force-warn clippy::semicolon-if-nothing-returned`

warning: `_main` (bin "_main") generated 1 warning (run `cargo clippy --fix --bin "_main"` to apply 1 suggestion)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s

However after applying these diagnostics, the resulting code:

use std::ptr;

fn main() {
    let a_billion_dollar_mistake = ptr::null();

    unsafe {
        *a_billion_dollar_mistake;
    }
}

no longer compiled:

error[E0283]: type annotations needed for `*const _`
   --> src/main.rs:4:9
    |
4   |     let a_billion_dollar_mistake = ptr::null();
    |         ^^^^^^^^^^^^^^^^^^^^^^^^   ----------- type must be known at this point
    |
    = note: cannot satisfy `_: Thin`
note: required by a bound in `null`
   --> /home/matthias/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:828:31
    |
828 | pub const fn null<T: ?Sized + Thin>() -> *const T {
    |                               ^^^^ required by this bound in `null`
help: consider giving `a_billion_dollar_mistake` an explicit type, where the type for type parameter `T` is specified
    |
4   |     let a_billion_dollar_mistake: *const T = ptr::null();
    |                                 ++++++++++

Version:

rustc 1.89.0-nightly (cf423712b 2025-06-05)
binary: rustc
commit-hash: cf423712b9e95e9f6ec84b1ecb3d125e55ac8d56
commit-date: 2025-06-05
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5

Start by reproducing the reported semicolon_if_nothing_returned diagnostic with the Rust snippet and inspect that lint's implementation and existing tests. The fix is done when applying the lint suggestion preserves compilation for this case and a regression test covers the behavior.