[media] gspca - cpia1: Fix error check

It looks to me like it was intended to check the return value
at this point.
Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/cpia1.c

@@ -829,7 +829,7 @@ static int goto_low_power(struct gspca_dev *gspca_dev)
 	if (ret)
 		return ret;
 
-	do_command(gspca_dev, CPIA_COMMAND_GetCameraStatus, 0, 0, 0, 0);
+	ret = do_command(gspca_dev, CPIA_COMMAND_GetCameraStatus, 0, 0, 0, 0);
 	if (ret)
 		return ret;