selftests/bpf: Fix repeat option when kfunc_call verification fails

There is no way where topts.repeat can be set to 1 when tc_test fails.
Fix the typo where the break statement slipped by one line.

Fixes: fb66223a ("selftests/bpf: add test for accessing ctx from syscall program type")
Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/bpf/20230814031434.3077944-1-zouyipeng@huawei.com