[PATCH nft] segtree: don't check for overlaps if set definition is empty

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If the set comes without definition (ie. no elements) then skip check
for overlaps since set->init is NULL.

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/segtree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/segtree.c b/src/segtree.c
index 74f0fb3..fa11967 100644
--- a/src/segtree.c
+++ b/src/segtree.c
@@ -377,7 +377,7 @@ static int set_to_segtree(struct list_head *msgs, struct set *set,
 	/* We are updating an existing set with new elements, check if the new
 	 * interval overlaps with any of the existing ones.
 	 */
-	if (add && set->init != init) {
+	if (add && set->init && set->init != init) {
 		err = set_overlap(msgs, set, init, tree->keylen);
 		if (err < 0)
 			return err;
-- 
2.1.4

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