qdev: fix thinko leading to guest crashes

Without this fix, guest crashes with drive=virtio.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/qdev-properties.c

@@ -20,7 +20,7 @@ static void bit_prop_set(DeviceState *dev, Property *props, bool val)
     uint32_t *p = qdev_get_prop_ptr(dev, props);
     uint32_t mask = qdev_get_prop_mask(props);
     if (val)
-        *p |= ~mask;
+        *p |= mask;
     else
         *p &= ~mask;
 }