Apply suggestions from code review

Co-authored-by: bjorn3 <[email protected]>

Author: osiewicz

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -332,9 +332,7 @@ fn exported_symbols_provider_local(
                 rustc_middle::ty::CoroutineClosure(def_id, _) => *def_id,
                 rustc_middle::ty::CoroutineWitness(def_id, _) => *def_id,
                 rustc_middle::ty::Foreign(def_id) => *def_id,
-                _ => {
-                    return false;
-                }
+                _ => return false,
             };
             let Some(root_def_id) = root_def_id.as_local() else {
                 return false;
@@ -347,10 +345,7 @@ fn exported_symbols_provider_local(
         let is_instantiable_downstream = |did, type_args| {
             std::iter::once(tcx.type_of(did).skip_binder()).chain(type_args).all(|arg| {
                 arg.walk().all(|ty| {
-                    let Some(ty) = ty.as_type() else {
-                        return true;
-                    };
-                    !is_local_to_current_crate(ty)
+                    ty.as_type().map_or(true, |ty| !is_local_to_current_crate(ty))
                 })
             })
         };