dccp: fix a memleak for dccp_feat_init err process

[ Upstream commit e90ce2fc27cad7e7b1e72b9e66201a7a4c124c2b ]

In dccp_feat_init, when ccid_get_builtin_ccids failsto alloc
memory for rx.val, it should free tx.val before returning an
error.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>