not_unsafe_ptr_arg_deref false positives

Playground:

pub struct X2<T>(T, T);

impl<T> X2<*mut T> {
    pub fn foo(self, a: *mut T) -> Self {
        unsafe { self.bar(a) }
    }
    
    pub unsafe fn bar(self, _a: *mut T) -> Self {
        self
    }
}
fn main() {}

produces

error: this public function dereferences a raw pointer but is not marked `unsafe`
 --> src/main.rs:5:27
  |
5 |         unsafe { self.bar(a) }
  |                           ^
  |
  = note: #[deny(not_unsafe_ptr_arg_deref)] on by default
  = help: for further information visit https://rust-lang-nursery.github.io/rust-clippy/v0.0.212/index.html#not_unsafe_ptr_arg_deref

which is incorrect since no raw pointer is ever dereferenced anywhere.

Start with the linked Rust Playground reproduction and trace the not_unsafe_ptr_arg_deref lint that emits the diagnostic at self.bar(a). Confirm the false positive and update the lint behavior or its coverage so this example no longer reports a raw-pointer dereference.