src: allow flowtable definitions with no devices

The listing shows no devices:

 # nft list ruleset
 table ip x {
        flowtable y {
                hook ingress priority filter
        }
 }

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 0 insertions, 3 deletions

diff --git a/tests/shell/testcases/flowtable/0006segfault_0 b/tests/shell/testcases/flowtable/0006segfault_0
index de590b77..fb7c52fe 100755
--- a/tests/shell/testcases/flowtable/0006segfault_0
+++ b/tests/shell/testcases/flowtable/0006segfault_0
@@ -9,6 +9,3 @@ $NFT add flowtable ip t f { hook ingress priority 10\; devices = { lo } }
 
 $NFT add flowtable ip t f { hook ingress\; priority 10\; }
 [[ $? -eq 1 ]] || exit 1
-
-$NFT add flowtable ip t f { hook ingress priority 10\; }
-[[ $? -eq 1 ]] || exit 1