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/source/kern_k_light_client_session.cpp

@@ -37,7 +37,7 @@ namespace ams::kern {
         cur_thread->SetLightSessionData(data);
 
         /* Send the request. */
-        return m_parent->OnRequest(cur_thread);
+        R_RETURN(m_parent->OnRequest(cur_thread));
     }
 
 }