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devqspi: fix qunlock error on stat() -> close()

--- a/sys/src/9/zynq/devqspi.c

+++ b/sys/src/9/zynq/devqspi.c

@@ -213,7 +213,7 @@

 static void

 qspiclose(Chan* c)

 {

-	if(c->qid.path == Qboot)

+	if(c->qid.path == Qboot && (c->flag & COPEN) != 0)

 		qunlock(&qspil);

 }