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_handle_table.hpp

@@ -93,7 +93,7 @@ namespace ams::kern {
                     m_free_head_index                = i;
                 }
 
-                return ResultSuccess();
+                R_SUCCEED();
             }
 
             constexpr ALWAYS_INLINE size_t GetTableSize() const { return m_table_size; }