ci: check cargo fmt for htp

.github/workflows/rust.yml

@@ -108,5 +108,5 @@ jobs:
               exit 1
           fi
       # does not work in other subdirectories for now
-      - run: cargo fmt
+      - run: cargo fmt --check
         working-directory: rust/htp

rust/htp/src/lib.rs

@@ -6,11 +6,9 @@
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
 #![allow(non_upper_case_globals)]
-
 // Allow unknown lints, our MSRV doesn't know them all, for
 // example static_mut_refs.
 #![allow(unknown_lints)]
-
 // Requires MSRV of 1.74 to fix.
 #![allow(clippy::io_other_error)]