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nusb/disk: adding identical partition is a no-op

--- a/sys/src/cmd/nusb/disk/disk.c

+++ b/sys/src/cmd/nusb/disk/disk.c

@@ -75,7 +75,11 @@

 		werrstr("bad partition boundaries");

 		return -1;

 	}

-	if(lookpart(lun, name) != nil) {

+	p = lookpart(lun, name);

+	if(p != nil){

+		/* adding identical partition is no-op */

+		if(p->offset == start && p->length == end - start && p->mode == mode)

+			return 0;

 		werrstr("partition name already in use");

 		return -1;

 	}