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

mojo/edk/system/local_message_pipe_endpoint.cc

Index: mojo/edk/system/local_message_pipe_endpoint.cc
diff --git a/mojo/edk/system/local_message_pipe_endpoint.cc b/mojo/edk/system/local_message_pipe_endpoint.cc
index 276a009df0cc8490a854a99114d377eec8ad0e5f..1b53d113d7df96bc043a3040bb48acbf8607ab35 100644
--- a/mojo/edk/system/local_message_pipe_endpoint.cc
+++ b/mojo/edk/system/local_message_pipe_endpoint.cc
@@ -157,18 +157,15 @@ MojoResult LocalMessagePipeEndpoint::AddAwakable(
   DCHECK(is_open_);
 
   HandleSignalsState state = GetHandleSignalsState();
+  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;