bpftool: fix BTF raw dump of FWD's fwd_kind

kflag bit determines whether FWD is for struct or union. Use that bit.

Fixes: c93cc690 ("bpftool: add ability to dump BTF types")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

tools/bpf/bpftool/btf.c

@@ -208,7 +208,7 @@ static int dump_btf_type(const struct btf *btf, __u32 id,
 		break;
 	}
 	case BTF_KIND_FWD: {
-		const char *fwd_kind = BTF_INFO_KIND(t->info) ? "union"
+		const char *fwd_kind = BTF_INFO_KFLAG(t->info) ? "union"
 							       : "struct";
 
 		if (json_output)