ceph: remove unnecessary checks in __dcache_readdir

we never add snapdir and the hidden .ceph dir into readdir cache
Signed-off-by: NYan, Zheng <zyan@redhat.com>

fs/ceph/dir.c

@@ -228,8 +228,6 @@ static int __dcache_readdir(struct file *file,  struct dir_context *ctx,
 		spin_lock(&dentry->d_lock);
 		if (di->lease_shared_gen == shared_gen &&
 		    d_really_is_positive(dentry) &&
-		    ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR &&
-		    ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH &&
 		    fpos_cmp(ctx->pos, di->offset) <= 0) {
 			emit_dentry = true;
 		}