landlock: opened file never has a negative dentry

Reviewed-by: Christian Brauner <brauner@kernel.org>
Acked-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

security/landlock/syscalls.c

@@ -303,7 +303,6 @@ static int get_path_from_fd(const s32 fd, struct path *const path)
 	if ((fd_file(f)->f_op == &ruleset_fops) ||
 	    (fd_file(f)->f_path.mnt->mnt_flags & MNT_INTERNAL) ||
 	    (fd_file(f)->f_path.dentry->d_sb->s_flags & SB_NOUSER) ||
-	    d_is_negative(fd_file(f)->f_path.dentry) ||
 	    IS_PRIVATE(d_backing_inode(fd_file(f)->f_path.dentry)))
 		return -EBADFD;