media: usb: msi2500: Fix a possible null-pointer dereference in msi2500_stop_streaming()

In msi2500_stop_streaming(), there is an if statement on line 870 to
check whether dev->udev is NULL:
    if (dev->udev)

When dev->udev is NULL, it is used on line 877:
    msi2500_ctrl_msg(dev, CMD_STOP_STREAMING, 0)
        usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), ...)

Thus, a possible null-pointer dereference may occur.

To fix this bug, dev->udev is checked before calling msi2500_ctrl_msg().

This bug is found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/msi2500/msi2500.c

@@ -867,7 +867,7 @@ static void msi2500_stop_streaming(struct vb2_queue *vq)
 
 	/* according to tests, at least 700us delay is required  */
 	msleep(20);
-	if (!msi2500_ctrl_msg(dev, CMD_STOP_STREAMING, 0)) {
+	if (dev->udev && !msi2500_ctrl_msg(dev, CMD_STOP_STREAMING, 0)) {
 		/* sleep USB IF / ADC */
 		msi2500_ctrl_msg(dev, CMD_WREG, 0x01000003);
 	}