[media] s5p-mfc: Use WARN_ON(condition) directly

Use WARN_ON(condition) directly instead of wrapping around an if
condition.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/s5p-mfc/s5p_mfc.c

@@ -582,8 +582,7 @@ static void s5p_mfc_handle_stream_complete(struct s5p_mfc_ctx *ctx,
 
 	clear_work_bit(ctx);
 
-	if (test_and_clear_bit(0, &dev->hw_lock) == 0)
-		WARN_ON(1);
+	WARN_ON(test_and_clear_bit(0, &dev->hw_lock) == 0);
 
 	s5p_mfc_clock_off();
 	wake_up(&ctx->queue);