remove redundant wrapping of return types of allow_internal_unstable() and rustc_allow_const_fn_unstable()

compiler/rustc_passes/src/check_const.rs

@@ -106,7 +106,7 @@ impl<'tcx> CheckConstVisitor<'tcx> {
             // However, we cannot allow stable `const fn`s to use unstable features without an explicit
             // opt-in via `rustc_allow_const_fn_unstable`.
             attr::rustc_allow_const_fn_unstable(&tcx.sess, &tcx.get_attrs(def_id))
-                .map_or(false, |mut features| features.any(|name| name == feature_gate))
+                .any(|name| name == feature_gate)
         };
 
         match required_gates {