test-netlink-policy: Fix missing field initializer warnings on older … #2969

Job	Run time
dpdk gcc (ubuntu-24.04)	8s
libreswan (ubuntu-24.04)	7s
linux deb no dpdk	14m 59s
osx clang --disable-ssl	2m 18s
linux rpm fedora	3m 38s
clang-analyze-cache	12m 3s
linux clang --disable-ssl	4m 55s
linux gcc --disable-ssl	3m 9s
linux gcc test --enable-shared	13m 22s
linux clang c99	4m 51s
linux gcc test	9m 58s
linux gcc check check-dpdk dpdk	19m 43s
linux gcc c99	4m 56s
linux clang check check-dpdk dpdk	20m 8s
linux clang address,undefined test	18m 21s
linux clang test -ljemalloc	10m 4s
linux clang test --enable-shared	13m 7s
linux gcc dpdk-shared	3m 43s
linux clang dpdk --enable-shared	5m 47s
linux gcc --enable-afxdp	3m 9s
linux gcc dpdk --enable-shared	3m 55s
linux gcc m32 --disable-ssl	5m 33s
linux clang dpdk-shared	4m 37s
linux clang --enable-afxdp	3m 2s
linux gcc dpdk-shared --enable-shared	4m 13s
linux gcc check-ovsdb-cluster	9m 13s
linux gcc test -ljemalloc	9m 30s
linux clang address,undefined check-kernel -100	16m 1s
linux gcc check-kernel 100-	19m 22s
linux clang dpdk-shared --enable-shared	3m 51s
linux gcc check-kernel -100	12m 57s
linux clang address,undefined dpdk check-system-userspace	17m 18s
linux clang address,undefined check-kernel 100-	24m 37s
linux gcc check-offloads 100-	12m 22s
linux gcc check-offloads -100	10m 50s
linux gcc dpdk check-system-userspace	14m 25s
linux gcc dpdk check-system-tso	13m 48s
linux gcc dpdk check-afxdp	13m 4s
clang-analyze	11m 17s
	6h 18m 21s

Provide feedback