argon2: configure lints at the toplevel

To pass the newly enabled clippy lints, add a missing safety comment to
the compress_avx2 call.

Author: jonasmalacofilho

argon2/src/lib.rs

@@ -13,8 +13,10 @@
     clippy::cast_sign_loss,
     clippy::checked_conversions,
     clippy::implicit_saturating_sub,
+    clippy::missing_safety_doc,
     clippy::panic,
     clippy::panic_in_result_fn,
+    clippy::undocumented_unsafe_blocks,
     clippy::unwrap_used,
     missing_docs,
     rust_2018_idioms,
@@ -525,6 +527,7 @@ impl<'key> Argon2<'key> {
             }
 
             if self.cpu_feat_avx2.get() {
+                // SAFETY: checked that AVX2 was detected.
                 return unsafe { compress_avx2(rhs, lhs) };
             }
         }

argon2/src/memory.rs

@@ -8,12 +8,6 @@
 //! > length of q/SL. Segments of the same slice can be computed in parallel and do not reference
 //! > blocks from each other. All other blocks can be referenced.
 
-#![warn(
-    clippy::undocumented_unsafe_blocks,
-    clippy::missing_safety_doc,
-    unsafe_op_in_unsafe_fn
-)]
-
 use core::marker::PhantomData;
 use core::ptr::NonNull;