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Zero-length arrays are deprecated and we are moving towards adopting C99 flexible-array members, instead. So, replace zero-length arrays declarations alone in structs with the new DECLARE_FLEX_ARRAY() helper macro. This helper allows for flexible-array members alone in structs. Link: https://github.com/KSPP/linux/issues/193 Link: https://github.com/KSPP/linux/issues/285 Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Tested-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/ZGKGiBxP0zHo6XSK@work Signed-off-by: Jakub Kicinski <kuba@kernel.org>