drbd: fifo_alloc() should use struct_size
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: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Stephen Kitt <steve@sk2.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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