selftests/bpf: Drop an unused local variable

Some copy/paste leftover, this is never used.

Fixes: e3d9eac99a ("selftests/bpf: wq: add bpf_wq_init() checks")
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/20240430-bpf-next-v3-3-27afe7f3b17c@kernel.org

tools/testing/selftests/bpf/prog_tests/wq.c

@@ -36,7 +36,5 @@ void serial_test_wq(void)
 
 void serial_test_failures_wq(void)
 {
-	LIBBPF_OPTS(bpf_test_run_opts, topts);
-
 	RUN_TESTS(wq_failures);
 }