[NaCl SDK] Create Filesystem nodes in /dev/fs/...

native_client_sdk/src/libraries/nacl_io/kernel_object.cc

Index: native_client_sdk/src/libraries/nacl_io/kernel_object.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_object.cc b/native_client_sdk/src/libraries/nacl_io/kernel_object.cc
index 98362ebf3101be9bbf22448196681a57ad8f8f39..8b64ca15caa1414f319f16285a952aefa85423f0 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_object.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_object.cc
@@ -40,7 +40,8 @@ Error KernelObject::AttachFsAtPath(const ScopedFilesystem& fs,
   return 0;
 }
 
-Error KernelObject::DetachFsAtPath(const std::string& path) {
+Error KernelObject::DetachFsAtPath(const std::string& path,
+                                   ScopedFilesystem* out_fs) {
   std::string abs_path = GetAbsParts(path).Join();
 
   AUTO_LOCK(fs_lock_);
@@ -52,6 +53,8 @@ Error KernelObject::DetachFsAtPath(const std::string& path) {
   if (it->second->RefCount() != 1)
     return EBUSY;
 
+  *out_fs = it->second;
+
   filesystems_.erase(it);
   return 0;
 }