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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 in anonymous union with the new __DECLARE_FLEX_ARRAY() helper macro. This helper allows for flexible-array members in unions. Link: https://github.com/KSPP/linux/issues/193 Link: https://github.com/KSPP/linux/issues/227 Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>