server: include 32/64-bit in probe

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.c b/server.c
index ad07a0e..ac6c2fb 100644
--- a/server.c
+++ b/server.c
@@ -398,6 +398,8 @@
 	probe.os	= FIO_OS;
 	probe.arch	= FIO_ARCH;
 
+	probe.bpp	= sizeof(void *);
+
 	return fio_net_send_cmd(server_fd, FIO_NET_CMD_PROBE, &probe, sizeof(probe), cmd->tag);
 }