ARM: 8522/1: drivers: nvdimm: ensure no negative value gets returned on positive match

This patch ensures that existing bus match callbacks don't return
negative values (which might be interpreted as potential errors in the
future) in case of positive match.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

drivers/nvdimm/bus.c

@@ -62,7 +62,7 @@ static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
 {
 	struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
 
-	return test_bit(to_nd_device_type(dev), &nd_drv->type);
+	return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
 }
 
 static struct module *to_bus_provider(struct device *dev)