libbpf: Remove duplicate assignments

There is a same action when load_attr.attach_btf_id is initialized.
Signed-off-by: Mehrdad Arshad Rad <arshad.rad@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211128193337.10628-1-arshad.rad@gmail.com

tools/lib/bpf/libbpf.c

@@ -6559,7 +6559,6 @@ static int bpf_object_load_prog_instance(struct bpf_object *obj, struct bpf_prog
 	load_attr.expected_attach_type = prog->expected_attach_type;
 	if (kernel_supports(obj, FEAT_PROG_NAME))
 		prog_name = prog->name;
-	load_attr.attach_btf_id = prog->attach_btf_id;
 	load_attr.attach_prog_fd = prog->attach_prog_fd;
 	load_attr.attach_btf_obj_fd = prog->attach_btf_obj_fd;
 	load_attr.attach_btf_id = prog->attach_btf_id;