housekeeping(server): fixed clippy warns

server/crates/arbiter-crypto/src/lib.rs

@@ -1,7 +1,5 @@
-
 #[cfg(feature = "authn")]
 pub mod authn;
 
-
 #[cfg(feature = "safecell")]
-pub mod safecell;
+pub mod safecell;

server/crates/arbiter-crypto/src/safecell.rs

@@ -107,7 +107,7 @@ fn abort_memory_breach(action: &str, err: &memsafe::error::MemoryError) -> ! {
     eprintln!("fatal {action}: {err}");
     // SAFETY: Intentionally cause a segmentation fault to prevent further execution in a compromised state.
     unsafe {
-        let unsafe_pointer = 0x0 as *mut u8;
+        let unsafe_pointer = std::ptr::null_mut::<u8>();
         std::ptr::write_volatile(unsafe_pointer, 0);
     }
     std::process::abort();