vfs: stop clearing close on exec when closing a fd

Codepaths allocating a fd always make sure the bit is set/unset
depending on flags, thus clearing on close is redundant.
Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/file.c

@@ -631,7 +631,6 @@ int __close_fd(struct files_struct *files, unsigned fd)
 	if (!file)
 		goto out_unlock;
 	rcu_assign_pointer(fdt->fd[fd], NULL);
-	__clear_close_on_exec(fd, fdt);
 	__put_unused_fd(files, fd);
 	spin_unlock(&files->file_lock);
 	return filp_close(file, files);