Kenrel: Cleanup locking in close

kernel/kernel/OpenFileDescriptorSet.cpp

@@ -400,12 +400,20 @@ namespace Kernel
 	}
 
 	BAN::ErrorOr<void> OpenFileDescriptorSet::close(int fd)
+	{
+		BAN::RefPtr<OpenFileDescription> open_file;
+
 		{
 			LockGuard _(m_mutex);
 
 			TRY(validate_fd(fd));
 
-		auto& open_file = m_open_files[fd];
+			open_file = m_open_files[fd];
+
+			m_open_files[fd]->file.inode->on_close(m_open_files[fd]->status_flags);
+			m_open_files[fd] = {};
+			remove_cloexec(fd);
+		}
 
 		if (auto& flock = open_file->flock; Thread::current().has_process() && flock.lockers.contains(Process::current().pid()))
 		{
@@ -429,10 +437,6 @@ namespace Kernel
 			}
 		}
 
-		open_file->file.inode->on_close(open_file->status_flags);
-		open_file = {};
-		remove_cloexec(fd);
-
 		return {};
 	}