[NaCl SDK] nacl_io: add return value to nacl_io_init.

native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "nacl_io/kernel_intercept.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <string.h>
 
@@ skipping 92 matching lines @@
   if (s_state.kp->Init(ppapi) != 0)
     return 1;
 
   return 0;
 }
 
 int ki_is_initialized() {
   return s_state.kp != NULL;
 }
 
-void ki_uninit() {
+int ki_uninit() {
   LOG_TRACE("ki_uninit");
+  assert(s_state.kp);
+  if (s_state.kp == NULL)
+    return 1;
+
   if (s_saved_state.kp == NULL)
     kernel_wrap_uninit();
 
   // If we are going to delete the KernelProxy don't do it
   // until we've swapped it out.
   KernelInterceptState state_to_delete = s_state;
 
   ki_pop_state();
 
   if (state_to_delete.kp_owned)
     delete state_to_delete.kp;
 
   delete state_to_delete.ppapi;
+  return 0;
 }
 
 nacl_io::KernelProxy* ki_get_proxy() {
   return s_state.kp;
 }
 
 int ki_chdir(const char* path) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->chdir(path);
 }
@@ skipping 474 matching lines @@
 int ki_socket(int domain, int type, int protocol) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->socket(domain, type, protocol);
 }
 
 int ki_socketpair(int domain, int type, int protocol, int* sv) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->socketpair(domain, type, protocol, sv);
 }
 #endif  // PROVIDES_SOCKET_API