rem: static struct read_chunk *search_read_chunk(struct sshfs_file *sf, size_t size, off_t offset)
add: static struct read_chunk *search_read_chunk(struct sshfs_file *sf, off_t offset)
context: static struct read_chunk *search_read_chunk(struct sshfs_file *sf, size_t size,                                            off_t offset){    struct read_chunk *ch = sf->readahead;    if (ch && ch->offset == offset && ch->size == size) {        ch->refs++;        return ch;    } else        return NULL;}