Integrate new result macros. (#1780)

* result: try out some experimental shenanigans

* result: sketch out some more shenanigans

* result: see what it looks like to convert kernel to use result conds instead of guards

* make rest of kernel use experimental new macro-ing

libraries/libmesosphere/include/mesosphere/kern_k_readable_event.hpp

@@ -44,7 +44,7 @@ namespace ams::kern {
                 /* Try to perform a reset, succeeding unconditionally. */
                 this->Reset();
 
-                return ResultSuccess();
+                R_SUCCEED();
             }
 
             virtual bool IsSignaled() const override;