bpftool: Respect the -d option in struct_ops cmd

In the prog cmd, the "-d" option turns on the verifier log.
This is missed in the "struct_ops" cmd and this patch fixes it.

Fixes: 65c93628 ("bpftool: Add struct_ops support")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20200424182911.1259355-1-kafai@fb.com

tools/bpf/bpftool/struct_ops.c

@@ -479,6 +479,7 @@ static int do_unregister(int argc, char **argv)
 
 static int do_register(int argc, char **argv)
 {
+	struct bpf_object_load_attr load_attr = {};
 	const struct bpf_map_def *def;
 	struct bpf_map_info info = {};
 	__u32 info_len = sizeof(info);
@@ -499,7 +500,12 @@ static int do_register(int argc, char **argv)
 
 	set_max_rlimit();
 
-	if (bpf_object__load(obj)) {
+	load_attr.obj = obj;
+	if (verifier_logs)
+		/* log_level1 + log_level2 + stats, but not stable UAPI */
+		load_attr.log_level = 1 + 2 + 4;
+
+	if (bpf_object__load_xattr(&load_attr)) {
 		bpf_object__close(obj);
 		return -1;
 	}