Address clippy::redundant_slicing warnings.

mk/clippy.sh

@@ -34,8 +34,6 @@ cargo clippy \
   --allow clippy::needless_range_loop \
   --allow clippy::new_without_default \
   --allow clippy::neg_cmp_op_on_partial_ord \
-  --allow clippy::range_plus_one \
-  --allow clippy::redundant_slicing \
   --allow clippy::too_many_arguments \
   --allow clippy::trivially_copy_pass_by_ref \
   --allow clippy::type_complexity \

src/limb.rs

@@ -218,9 +218,7 @@ pub fn parse_big_endian_and_pad_consttime(
         return Err(error::Unspecified);
     }
 
-    for r in &mut result[..] {
-        *r = 0;
-    }
+    result.fill(0);
 
     // XXX: Questionable as far as constant-timedness is concerned.
     // TODO: Improve this.