dbs-utils: Fix clippy issues caused by rust 1.68.2

Obtaining reference of unaligned fields is being phased out. Therefore,
`&struct.field` is replaced with `std::ptr::addr_of!(struct.field)` to
avoid those warning issues. For more details, please refer to
rust-lang/rust#82523.

Fixes: openanolis#273

Signed-off-by: Xuewei Niu <niuxuewei.nxw@antgroup.com>

crates/dbs-utils/src/net/net_gen/if_tun.rs

@@ -347,8 +347,10 @@ fn bindgen_test_layout_ethhdr() {
  1usize,
  concat!("Alignment of ", stringify!(ethhdr))
  );
+ let ethhdr_test = ethhdr::default();
+ let p_ethhdr_test = &ethhdr_test as *const ethhdr as usize;
  assert_eq!(
- unsafe { &(*(0 as *const ethhdr)).h_dest as *const _ as usize },
+ std::ptr::addr_of!(ethhdr_test.h_dest) as usize - p_ethhdr_test,
  0usize,
  concat!(
  "Alignment of field: ",
@@ -358,7 +360,7 @@ fn bindgen_test_layout_ethhdr() {
  )
  );
  assert_eq!(
- unsafe { &(*(0 as *const ethhdr)).h_source as *const _ as usize },
+ std::ptr::addr_of!(ethhdr_test.h_source) as usize - p_ethhdr_test,
  6usize,
  concat!(
  "Alignment of field: ",
@@ -368,7 +370,7 @@ fn bindgen_test_layout_ethhdr() {
  )
  );
  assert_eq!(
- unsafe { &(*(0 as *const ethhdr)).h_proto as *const _ as usize },
+ std::ptr::addr_of!(ethhdr_test.h_proto) as usize - p_ethhdr_test,
  12usize,
  concat!(
  "Alignment of field: ",

crates/dbs-utils/src/net/net_gen/mod.rs

@@ -6,7 +6,6 @@
 #![allow(non_upper_case_globals)]
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
-#![allow(unaligned_references)]
 #![allow(missing_docs)]
 #![allow(deref_nullptr)]