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fcp: use IOUNIT as default size

--- a/sys/src/cmd/fcp.c

+++ b/sys/src/cmd/fcp.c

@@ -1,6 +1,6 @@

 #include <u.h>

 #include <libc.h>

-#define	DEFB	(8*1024)

+

 #define	Nwork	8

 int	buflen;

@@ -134,7 +134,7 @@

 	buflen = iounit(fdf);

 	if(buflen <= 0)

-		buflen = DEFB;

+		buflen = IOUNIT;

 	if(copy1(fdf, fdt, from, to)==0 && (xflag || gflag || uflag)){

 		nulldir(&dirt);