Make non-zero check more obvious

Author: WaffleLapkin

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -464,7 +464,7 @@ fn virtual_call_violation_for_method<'tcx>(
 
     // We can't monomorphize things like `fn foo<A>(...)`.
     let own_counts = tcx.generics_of(method.def_id).own_counts();
-    if own_counts.types + own_counts.consts != 0 {
+    if own_counts.types > 0 || own_counts.consts > 0 {
         return Some(MethodViolationCode::Generic);
     }