Small clippy::correctness fixes

Nothing was really incorrect before, but it did get nicer.

Author: Noratrieb

compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs

@@ -302,7 +302,7 @@ impl<'tcx> InherentOverlapChecker<'tcx> {
                         .iter()
                         .flatten()
                         .map(|r| r.impl_blocks.len() as isize - avg as isize)
-                        .map(|v| v.abs() as usize)
+                        .map(|v| v.unsigned_abs())
                         .sum::<usize>();
                     s / connected_regions.len()
                 },

compiler/rustc_hir_typeck/src/generator_interior/mod.rs

@@ -313,8 +313,7 @@ pub fn resolve_interior<'a, 'tcx>(
     // Extract type components to build the witness type.
     let type_list = fcx.tcx.mk_type_list_from_iter(type_causes.iter().map(|cause| cause.ty));
     let bound_vars = fcx.tcx.mk_bound_variable_kinds(&bound_vars);
-    let witness =
-        fcx.tcx.mk_generator_witness(ty::Binder::bind_with_vars(type_list, bound_vars.clone()));
+    let witness = fcx.tcx.mk_generator_witness(ty::Binder::bind_with_vars(type_list, bound_vars));
 
     drop(typeck_results);
     // Store the generator types and spans into the typeck results for this generator.

compiler/rustc_hir_typeck/src/method/probe.rs

@@ -1755,16 +1755,15 @@ impl<'a, 'tcx> ProbeContext<'a, 'tcx> {
     fn probe_for_similar_candidate(&mut self) -> Result<Option<ty::AssocItem>, MethodError<'tcx>> {
         debug!("probing for method names similar to {:?}", self.method_name);
 
-        let steps = self.steps.clone();
         self.probe(|_| {
             let mut pcx = ProbeContext::new(
                 self.fcx,
                 self.span,
                 self.mode,
                 self.method_name,
                 self.return_type,
-                &self.orig_steps_var_values,
-                steps,
+                self.orig_steps_var_values,
+                self.steps,
                 self.scope_expr_id,
             );
             pcx.allow_similar_names = true;