UPSTREAM: netfilter: nft_set_rbtree: skip end interval element from gc

commit 60c0c230 upstream.

rbtree lazy gc on insert might collect an end interval element that has
been just added in this transactions, skip end interval elements that
are not yet active.

Bug: 325477234
Fixes: f718863a ("netfilter: nft_set_rbtree: fix overlap expiration walk")
Cc: stable@vger.kernel.org
Reported-by: lonial con <kongln9170@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 10e9cb39)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I42f7bca418d47948292b15ace9f371b81ccd7fe8