msi2500: move msi3101 out of staging and rename

Hello Antti Palosaari,

The patch fd8b5f502929: "msi2500: move msi3101 out of staging and rename" from Jul 13, 2014, leads to the following static checker warning:

drivers/media/usb/msi2500/msi2500.c:887 msi2500_stop_streaming()

	 error: we previously assumed 's->udev' could be null (see line 880)

drivers/media/usb/msi2500/msi2500.c
872 static void msi2500_stop_streaming(struct vb2_queue *vq) 873 {
874 struct msi2500_state *s = vb2_get_drv_priv(vq);
875
876 dev_dbg(&s->udev->dev, "%s:\n", __func__);
877
878 mutex_lock(&s->v4l2_lock);
879
880 if (s->udev)

                    ^^^^^^^

Check.

881 msi2500_isoc_cleanup(s);
882
883 msi2500_cleanup_queued_bufs(s);
884

   885          /* according to tests, at least 700us delay is required  */
   886          msleep(20);
   887          if (!msi2500_ctrl_msg(s, CMD_STOP_STREAMING, 0)) {
                     ^^^^^^^^^^^^^^^^^^

Unchecked dereference if you have debugging enabled.

   888                  /* sleep USB IF / ADC */
   889                  msi2500_ctrl_msg(s, CMD_WREG, 0x01000003);
   890          }

regards,
dan carpenter