netfilter: ebtables: replace zero-length array members
As suggested by Kees[1], replace the old-style 0-element array members
of multiple structs in ebtables.h with modern C99 flexible array.
[1]: https://lore.kernel.org/all/
5E8E0F9C-EE3F-4B0D-B827-
DC47397E2A4A@kernel.org/
[ fw@strlen.de:
keep struct ebt_entry_target as-is, causes compiler warning:
"variable sized type 'struct ebt_entry_target' not at the end of a
struct or class is a GNU extension" ]
Link: https://github.com/KSPP/linux/issues/21
Signed-off-by: GONG, Ruiqi <gongruiqi1@huawei.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Florian Westphal <fw@strlen.de>