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sdvirtio: return 1 for success in vioenable()/viodisable()

--- a/sys/src/9/pc/sdvirtio.c

+++ b/sys/src/9/pc/sdvirtio.c

@@ -579,7 +579,7 @@

 	snprint(name, sizeof(name), "%s (%s)", sd->name, sd->ifc->name);

 	intrenable(vd->pci->intl, viointerrupt, vd, vd->pci->tbdf, name);

 	outb(vd->port+Status, inb(vd->port+Status) | DriverOk);

-	return 0;

+	return 1;

 }

 static int

@@ -591,7 +591,7 @@

 	vd = sd->ctlr;

 	snprint(name, sizeof(name), "%s (%s)", sd->name, sd->ifc->name);

 	intrdisable(vd->pci->intl, viointerrupt, vd, vd->pci->tbdf, name);

-	return 0;

+	return 1;

 }

 static SDev*