Make Dispatcher::AddAwakable(), etc. always set *signals_state (if signals_state is non-null).

mojo/edk/system/simple_dispatcher.cc

Index: mojo/edk/system/simple_dispatcher.cc
diff --git a/mojo/edk/system/simple_dispatcher.cc b/mojo/edk/system/simple_dispatcher.cc
index c3dcd61ebce923009cbaceb2ce1af6449f13ce4a..a4a515ca0cdb5ee1ec214c56339161716fcbe1e3 100644
--- a/mojo/edk/system/simple_dispatcher.cc
+++ b/mojo/edk/system/simple_dispatcher.cc
@@ -34,18 +34,15 @@ MojoResult SimpleDispatcher::AddAwakableImplNoLock(
   mutex().AssertHeld();
 
   HandleSignalsState state(GetHandleSignalsStateImplNoLock());
+  if (signals_state)
+    *signals_state = state;
   if (state.satisfies(signals)) {
     if (force)
       awakable_list_.Add(awakable, signals, context);
-    if (signals_state)
-      *signals_state = state;
     return MOJO_RESULT_ALREADY_EXISTS;
   }
-  if (!state.can_satisfy(signals)) {
-    if (signals_state)
-      *signals_state = state;
+  if (!state.can_satisfy(signals))
     return MOJO_RESULT_FAILED_PRECONDITION;
-  }
 
   awakable_list_.Add(awakable, signals, context);
   return MOJO_RESULT_OK;