typedef struct pre##_ofbctx { \
pre##_ctx ctx; /* Underlying cipher context */ \
unsigned off; /* Current offset in buffer */ \
- octet iv[PRE##_BLKSZ]; /* Output buffer and IV */ \
+ octet b[PRE##_BLKSZ]; /* Output buffer and IV */ \
} pre##_ofbctx; \
\
/* --- @pre_ofbgetiv@ --- * \