Kernel: Simplify Device::open().

Kernel/Devices/Device.cpp

@@ -15,7 +15,8 @@ Device::~Device()
 
 KResultOr<Retained<FileDescriptor>> Device::open(int options)
 {
-    return VFS::the().open(*this, options);
+    UNUSED_PARAM(options);
+    return FileDescriptor::create(this);
 }
 
 void Device::close()

Kernel/FileSystem/VirtualFileSystem.cpp

@@ -120,13 +120,6 @@ void VFS::traverse_directory_inode(Inode& dir_inode, Function<bool(const FS::Dir
     });
 }
 
-KResultOr<Retained<FileDescriptor>> VFS::open(RetainPtr<Device>&& device, int options)
-{
-    // FIXME: Respect options.
-    (void)options;
-    return FileDescriptor::create(move(device));
-}
-
 KResult VFS::utime(StringView path, Inode& base, time_t atime, time_t mtime)
 {
     auto descriptor_or_error = VFS::the().open(move(path), 0, 0, base);

Kernel/TTY/PTYMultiplexer.cpp

@@ -30,6 +30,7 @@ PTYMultiplexer::~PTYMultiplexer()
 
 KResultOr<Retained<FileDescriptor>> PTYMultiplexer::open(int options)
 {
+    UNUSED_PARAM(options);
     LOCKER(m_lock);
     if (m_freelist.is_empty())
         return KResult(-EBUSY);
@@ -38,7 +39,7 @@ KResultOr<Retained<FileDescriptor>> PTYMultiplexer::open(int options)
 #ifdef PTMX_DEBUG
     dbgprintf("PTYMultiplexer::open: Vending master %u\n", master->index());
 #endif
-    return VFS::the().open(move(master), options);
+    return FileDescriptor::create(master.ptr());
 }
 
 void PTYMultiplexer::notify_master_destroyed(Badge<MasterPTY>, unsigned index)