bpf/selftests: Fix ASSERT_OK condition check in uprobe_syscall test

Fixing ASSERT_OK condition check in uprobe_syscall test,
otherwise we return from test on pipe success.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20240726180847.684584-1-jolsa@kernel.org

Author: olsajiri

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

@@ -253,7 +253,7 @@ static void test_uretprobe_syscall_call(void)
 	struct uprobe_syscall_executed *skel;
 	int pid, status, err, go[2], c;
 
-	if (ASSERT_OK(pipe(go), "pipe"))
+	if (!ASSERT_OK(pipe(go), "pipe"))
 		return;
 
 	skel = uprobe_syscall_executed__open_and_load();