virtio: re-order vm_running and use_started checks

During migration the virtio device state can be restored before we
restart the VM. As no devices can be running while the VM is paused it
makes sense to bail out early in that case.

This returns the order introduced in:

 9f6bcfd (hw/virtio: move vm_running check to virtio_device_started)

to what virtio-sock was doing longhand.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Message-Id: <20221014132108.2559156-1-alex.bennee@linaro.org>
Tested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

include/hw/virtio/virtio.h

@@ -385,14 +385,14 @@ static inline bool virtio_is_big_endian(VirtIODevice *vdev)
 
 static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status)
 {
-    if (vdev->use_started) {
-        return vdev->started;
-    }
-
     if (!vdev->vm_running) {
         return false;
     }
 
+    if (vdev->use_started) {
+        return vdev->started;
+    }
+
     return status & VIRTIO_CONFIG_S_DRIVER_OK;
 }