Seems it doesn't like indexing into zero length arrays
either, it only allows C99 flexible array members.
Fixes warnings like:
UBSAN: array-index-out-of-bounds in /var/lib/dkms/rtl88x2bu/5.13.1/build/os_dep/linux/ioctl_cfg80211.c:1822:110
index 24 is out of range for type 'u8 [*]'