cifs: initialize ->tlink_tree in cifs_setup_cifs_sb()

no need to wait until cifs_read_super() and we need it done
by the time cifs_mount() will be called.

Acked-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/cifs/cifsfs.c

@@ -113,9 +113,6 @@ cifs_read_super(struct super_block *sb, struct smb_vol *volume_info,
 
 	cifs_sb = CIFS_SB(sb);
 
-	spin_lock_init(&cifs_sb->tlink_tree_lock);
-	cifs_sb->tlink_tree = RB_ROOT;
-
 	rc = cifs_mount(cifs_sb, volume_info);
 
 	if (rc) {