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xd: use new bio magic to make -u more efficient

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

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

@@ -58,6 +58,13 @@

 Biobuf	bin;

 Biobuf	bout;

+int

+flushout(Biobufhdr *bp, void *v, long n)

+{

+	Bflush(&bout);

+	return read(bp->fid, v, n);

+}

+

 void

 main(int argc, char *argv[])

 {

@@ -206,6 +213,7 @@

 		bp = &bin;

 		Binit(bp, fd, OREAD);

 	}

+	if(flush) Biofn(bp, flushout);

 	Blethal(bp, nil);

 	if(title)

 		xprint("%s\n", name);

@@ -237,15 +245,11 @@

 			xprint(ap->afmt, addr);

 			(*ap->fn)(ap->fmt);

 			xprint("\n", 0);

-			if(flush)

-				Bflush(&bout);

 		}

 		addr += ndata;

 		if(ndata<16){

 			xprint(afmt[0][abase], addr);

 			xprint("\n", 0);

-			if(flush)

-				Bflush(&bout);

 			break;

 		}

 	}