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libdraw: use IOUNIT for transfer block size in readimage()

--- a/sys/src/libdraw/readimage.c

+++ b/sys/src/libdraw/readimage.c

@@ -29,8 +29,11 @@

 		return nil;

 	if(d != nil)

 		chunk = d->bufsize - 32;	/* a little room for header */

-	else

-		chunk = 8192;

+	else {

+		chunk = iounit(fd);

+		if(chunk <= 0)

+			chunk = IOUNIT;

+	}

 	/*

 	 * distinguish new channel descriptor from old ldepth.