Bump workspace to edition 2024

- edition = "2024" in the workspace manifest and rsdosedit
- extern blocks must be unsafe: interrupts.rs ISR stubs -> unsafe extern "C"
- #[no_mangle] -> #[unsafe(no_mangle)] (efi_main, isr_dispatch)
- One missed static-mut read in free_list_insert wrapped in an explicit
  unsafe block (edition 2024 removed the implicit unsafe context inside
  unsafe fns)
- rustfmt reflows for 2024: nested if-lets become let-chains, imports
  re-sorted, rsdosedit help-screen box rows wrapped

No codegen-affecting changes. Validated: cargo check/clippy/fmt clean
(host + uefi target), make test-disk PASS, editor round-trip PASS.

1 files changed, 1 insertions, 5 deletions

diff --git a/rsnix/src/pci.rs b/rsnix/src/pci.rs
index efdbc01..21d7536 100644
--- a/rsnix/src/pci.rs
+++ b/rsnix/src/pci.rs
@@ -83,11 +83,7 @@ pub fn bar64(bus: u8, device: u8, func: u8, bar_index: u8) -> Option<u64> {
         0
     };
     let base = ((hi as u64) << 32) | (lo as u64 & 0xFFFF_FFF0);
-    if base == 0 {
-        None
-    } else {
-        Some(base)
-    }
+    if base == 0 { None } else { Some(base) }
 }
 
 /// Enumerate every device/function present on all buses.