Kernel module does not compile on 6.6

[timothyb89]

Attempting to build the kernel module fails on a fresh install of Raspberry Pi OS (bookworm) running the 6.6.20 kernel on a Pi 4:

pi@piradio5:~/nrc7292_sw_pkg/package/src/nrc $ uname -a
Linux piradio5 6.6.20+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.20-1+rpt1 (2024-03-07) aarch64 GNU/Linux
pi@piradio5:~/nrc7292_sw_pkg/package/src/nrc $ make

make[1]: Entering directory '/usr/src/linux-headers-6.6.20+rpt-rpi-v8'
  CC [M]  /home/pi/nrc7292_sw_pkg/package/src/nrc/nrc-netlink.o
/home/pi/nrc7292_sw_pkg/package/src/nrc/nrc-netlink.c:129:27: error: initialization of ‘int (*)(const struct genl_split_ops *, struct sk_buff *, struct genl_info *)’ from incompatible pointer type ‘int (*)(const struct genl_ops *, struct sk_buff *, struct genl_info *)’ [-Werror=incompatible-pointer-types]
  129 |         .pre_doit       = nrc_nl_pre_doit,
      |                           ^~~~~~~~~~~~~~~
/home/pi/nrc7292_sw_pkg/package/src/nrc/nrc-netlink.c:129:27: note: (near initialization for ‘nrc_nl_fam.pre_doit’)
/home/pi/nrc7292_sw_pkg/package/src/nrc/nrc-netlink.c:130:27: error: initialization of ‘void (*)(const struct genl_split_ops *, struct sk_buff *, struct genl_info *)’ from incompatible pointer type ‘void (*)(const struct genl_ops *, struct sk_buff *, struct genl_info *)’ [-Werror=incompatible-pointer-types]
  130 |         .post_doit      = nrc_nl_post_doit,
      |                           ^~~~~~~~~~~~~~~~
/home/pi/nrc7292_sw_pkg/package/src/nrc/nrc-netlink.c:130:27: note: (near initialization for ‘nrc_nl_fam.post_doit’)
cc1: all warnings being treated as errors
make[3]: *** [/usr/src/linux-headers-6.6.20+rpt-common-rpi/scripts/Makefile.build:248: /home/pi/nrc7292_sw_pkg/package/src/nrc/nrc-netlink.o] Error 1
make[2]: *** [/usr/src/linux-headers-6.6.20+rpt-common-rpi/Makefile:1938: /home/pi/nrc7292_sw_pkg/package/src/nrc] Error 2
make[1]: *** [/usr/src/linux-headers-6.6.20+rpt-common-rpi/Makefile:246: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.6.20+rpt-rpi-v8'
make: *** [Makefile:50: modules] Error 2