Switching to struct_size for the allocation in fifo_alloc avoids
hard-coding the type of fifo_buffer.values in fifo_alloc. It also
provides overflow protection; to avoid pessimistic code being
generated by the compiler as a result, this patch also switches
fifo_size to unsigned, propagating the change as appropriate.
Reviewed-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: NStephen Kitt <steve@sk2.org>
Signed-off-by: NJens Axboe <axboe@kernel.dk>