selftests/bpf: Fix u32 variable compared with less than zero

Variable ret is compared with less than zero even though it was set as u32.
So u32 to int conversion is needed.
Signed-off-by: NKang Minchul <tegongkang@gmail.com>
Acked-by: NRandy Dunlap <rdunlap@infradead.org>
Acked-by: NBjörn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20221105183656.86077-1-tegongkang@gmail.comSigned-off-by: NMartin KaFai Lau <martin.lau@kernel.org>

tools/testing/selftests/bpf/xskxceiver.c

@@ -1006,7 +1006,8 @@ static int __send_pkts(struct ifobject *ifobject, u32 *pkt_nb, struct pollfd *fd
 {
 	struct xsk_socket_info *xsk = ifobject->xsk;
 	bool use_poll = ifobject->use_poll;
-	u32 i, idx = 0, ret, valid_pkts = 0;
+	u32 i, idx = 0, valid_pkts = 0;
+	int ret;
 
 	while (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) < BATCH_SIZE) {
 		if (use_poll) {