Fix borrow_as_ptr lint

Author: nyurik

Cargo.toml

@@ -84,7 +84,6 @@ used_underscore_binding = "allow"
 wildcard_imports = "allow"
 
 # TODO
-borrow_as_ptr = "allow"
 match_same_arms = "allow"
 trivially_copy_pass_by_ref = "allow"
 needless_pass_by_value = "allow"

bindgen/clang.rs

@@ -494,7 +494,7 @@ impl Cursor {
     where
         Visitor: FnMut(Cursor) -> CXChildVisitResult,
     {
-        let data = &mut visitor as *mut Visitor;
+        let data = ptr::addr_of_mut!(visitor);
         unsafe {
             clang_visitChildren(self.x, visit_children::<Visitor>, data.cast());
         }