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nusb/disk: use IOUNIT constant for Maxiosize

This lets us take advantage of the now bigger 9p
I/O unit of the kernel.

--- a/sys/src/cmd/nusb/disk/scsireq.h

+++ b/sys/src/cmd/nusb/disk/scsireq.h

@@ -10,12 +10,7 @@

 enum {					/* fundamental constants/defaults */

 	MaxDirData	= 255,		/* max. direct data returned */

-	/*

-	 * Because we are accessed via devmnt, we can never get i/o counts

-	 * larger than 8216 (Msgsize and devmnt's offered iounit) - 24

-	 * (IOHDRSZ) = 8K.

-	 */

-	Maxiosize	= 8216 - IOHDRSZ, /* max. I/O transfer size */

+	Maxiosize	= IOUNIT,	/* max. I/O transfer size */

 };

 typedef struct {

-- 

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