Simplify useless map_or

Author: WaffleLapkin

compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs

@@ -140,19 +140,19 @@ impl<'tcx> InherentOverlapChecker<'tcx> {
         impl1_def_id: DefId,
         impl2_def_id: DefId,
     ) {
-        traits::overlapping_impls(
+        let maybe_overlap = traits::overlapping_impls(
             self.tcx,
             impl1_def_id,
             impl2_def_id,
             // We go ahead and just skip the leak check for
             // inherent impls without warning.
             SkipLeakCheck::Yes,
             overlap_mode,
-        )
-        .map_or(true, |overlap| {
+        );
+
+        if let Some(overlap) = maybe_overlap {
             self.check_for_common_items_in_impls(impl1_def_id, impl2_def_id, overlap);
-            false
-        });
+        }
     }
 
     fn check_item(&mut self, id: hir::ItemId) {