Fuchsia: Fix eventhandler for changed syscall return

runtime/bin/eventhandler_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "bin/eventhandler.h"
@@ skipping 57 matching lines @@
     }
     ASSERT(bytes == kInterruptMessageSize);
     if (msg.id == kTimerId) {
       timeout_queue_.UpdateTimeout(msg.dart_port, msg.data);
     } else if (msg.id == kShutdownId) {
       shutdown_ = true;
     } else {
       UNIMPLEMENTED();
     }
   }
-  // status == ERR_BAD_STATE when we try to read and there are no messages
-  // available, so it is an error if we get here and status != ERR_BAD_STATE.
-  if (status != ERR_BAD_STATE) {
+  // status == ERR_SHOULD_WAIT when we try to read and there are no messages
+  // available, so it is an error if we get here and status != ERR_SHOULD_WAIT.
+  if (status != ERR_SHOULD_WAIT) {
     FATAL1("mx_msgpipe_read failed: %s\n", mx_status_get_string(status));
   }
 }
 
 
 void EventHandlerImplementation::HandleEvents() {
   // TODO(zra): Handle events from other handles. At the moment we are only
   // interrupted when there is a message on interrupt_handles_[0].
   HandleInterruptFd();
 }
@@ skipping 73 matching lines @@
                                           int64_t data) {
   WakeupHandler(id, dart_port, data);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)
 
 #endif  // !defined(DART_IO_DISABLED)