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rio: add sanity check in xfidallocthread()

--- a/sys/src/cmd/rio/xfid.c

+++ b/sys/src/cmd/rio/xfid.c

@@ -70,6 +70,8 @@

 				fprint(2, "%p incref %ld\n", x, x->ref);

 				error("incref");

 			}

+			if(x->flushing)

+				error("flushing in allocate");

 			if(x->flushtag != -1)

 				error("flushtag in allocate");

 			incref(x);