selftests/bpf: Fix txmsg_redir of test_txmsg_pull in test_sockmap

selftests/bpf: Fix txmsg_redir of test_txmsg_pull in test_sockmap

[ Upstream commit b29e231d66303c12b7b8ac3ac2a057df06b161e8 ]

txmsg_redir in "Test pull + redirect" case of test_txmsg_pull should be
1 instead of 0.

Fixes: 328aa08a081b ("bpf: Selftests, break down test_sockmap into subtests")
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Zijian Zhang <zijianzhang@bytedance.com>
Link: https://lore.kernel.org/r/20241012203731.1248619-3-zijianzhang@bytedance.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>