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imx8: less stupid pci interrupt handler

--- a/sys/src/9/imx8/pciimx.c

+++ b/sys/src/9/imx8/pciimx.c

@@ -248,7 +248,7 @@

 {

 	Ctlr *ctlr = arg;

 	Intvec *vec;

-	u32int status, mask;

+	u32int status;

 	status = ctlr->dbi[MSI_CTRL_INT_0_STATUS];

 	if(status == 0)

@@ -256,8 +256,8 @@

 	ctlr->dbi[MSI_CTRL_INT_0_STATUS] = status;

 	ilock(ctlr);

-	for(vec = ctlr->vec, mask = 1; vec < &ctlr->vec[nelem(ctlr->vec)]; vec++, mask <<= 1){

-		if((status & mask) != 0 && vec->f != nil)

+	for(vec = ctlr->vec; status != 0 && vec < &ctlr->vec[nelem(ctlr->vec)]; vec++, status >>= 1){

+		if((status & 1) != 0 && vec->f != nil)

 			(*vec->f)(ureg, vec->a);

 	}

 	iunlock(ctlr);