strat: use m_ for member variables

stratosphere/fatal/source/fatal_event_manager.hpp

@@ -24,9 +24,9 @@ namespace ams::fatal::srv {
         public:
             static constexpr size_t NumFatalEvents = 3;
         private:
-            os::SdkMutex lock;
-            size_t num_events_gotten = 0;
-            os::SystemEventType events[NumFatalEvents];
+            os::SdkMutex m_lock;
+            size_t m_num_events_gotten = 0;
+            os::SystemEventType m_events[NumFatalEvents];
         public:
             FatalEventManager();
             Result GetEvent(const os::SystemEventType **out);