[NaCl SDK] nacl_io: fix invalid access to string data.

native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
index 430e49f4ae26c04e315dbc4904f26af769117b5f..f7a622fd7467226e3963461f0610f0e73d8dabd8 100644
--- a/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/html5fs/html5_fs.cc
@@ -147,15 +147,17 @@ Error Html5Fs::Rename(const Path& path, const Path& newpath) {
   if (error)
     return error;
 
-  const char* oldpath_full = GetFullPath(path).Join().c_str();
+  std::string oldpath_full = GetFullPath(path).Join();
   ScopedResource fileref_resource(
-      ppapi(), file_ref_iface_->Create(filesystem_resource_, oldpath_full));
+      ppapi(),
+      file_ref_iface_->Create(filesystem_resource_, oldpath_full.c_str()));
   if (!fileref_resource.pp_resource())
     return ENOENT;
 
-  const char* newpath_full = GetFullPath(newpath).Join().c_str();
+  std::string newpath_full = GetFullPath(newpath).Join();
   ScopedResource new_fileref_resource(
-      ppapi(), file_ref_iface_->Create(filesystem_resource_, newpath_full));
+      ppapi(),
+      file_ref_iface_->Create(filesystem_resource_, newpath_full.c_str()));
   if (!new_fileref_resource.pp_resource())
     return ENOENT;