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zynq: fix missing return argument for intr()

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

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

@@ -98,7 +98,7 @@

 	v = mpcore[ICCIAR];

 	irq = v & 0x3ff;

 	if(irq == 0x3ff)

-		return;

+		return 0;

 	m->intr++;

 	m->lastintr = irq;