media: au0828: fix spelling mistake: "completition" -> "completion"

Trivial fix to spelling mistake in au0828_isocdbg debug message
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/au0828/au0828-video.c

@@ -133,7 +133,7 @@ static void au0828_irq_callback(struct urb *urb)
 		au0828_isocdbg("au0828_irq_callback called: status kill\n");
 		return;
 	default:            /* unknown error */
-		au0828_isocdbg("urb completition error %d.\n", urb->status);
+		au0828_isocdbg("urb completion error %d.\n", urb->status);
 		break;
 	}