Description of problem:
not export functions about new_json_obj

Version-Release number of selected component (if applicable):
iproute-6.2.0-2.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1.yum install -y kernel-kernel-networking-sctp-bugs-slab_out_of_bounds_inet_diag_msg_sctpladdrs_fill_bz1484351.noarch
2.cd /mnt/tests/kernel/networking/sctp/bugs/slab_out_of_bounds_inet_diag_msg_sctpladdrs_fill_bz1484351
3.yum install -y iproute-devel nmap-ncat lksctp-tools-devel libmnl-devel
4.gcc -o sctp_diag_leak sctp_diag_leak.c -lsctp -lpthread -lnetlink -lmnl

Actual results:
# gcc -o sctp_diag_leak sctp_diag_leak.c -lsctp -lpthread -lnetlink -lmnl
In file included from sctp_diag_leak.c:33:
sctp_diag_leak.c: In function ‘main’:
sctp_diag_leak.c:146:32: warning: passing argument 2 of ‘rtnl_dump_filter_nc’ from incompatible pointer type [-Wincompatible-pointer-types]
  146 |         rtnl_dump_filter(&rth, callback, NULL);
      |                                ^~~~~~~~
      |                                |
      |                                int (*)(const struct sockaddr_nl *, struct nlmsghdr *, void *)
/usr/include/libnetlink.h:161:39: note: expected ‘rtnl_filter_t’ {aka ‘int (*)(struct nlmsghdr *, void *)’} but argument is of type ‘int (*)(const struct sockaddr_nl *, struct nlmsghdr *, void *)’
  161 |                         rtnl_filter_t filter,
      |                         ~~~~~~~~~~~~~~^~~~~~
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/11/../../../../lib64/libnetlink.a(libnetlink.o): in function `rtnl_echo_talk':
(.text[.text.group]+0x1f78): undefined reference to `new_json_obj'
/usr/bin/ld: (.text[.text.group]+0x1f7f): undefined reference to `open_json_object'
/usr/bin/ld: (.text[.text.group]+0x1f94): undefined reference to `close_json_object'
/usr/bin/ld: (.text[.text.group]+0x1f99): undefined reference to `delete_json_obj'
collect2: error: ld returned 1 exit status


Expected results:
no error

Additional info: