ASoC: samsung: spdif: Fix DMA filter initialization

This patch fixes issues introduced in commit 73f5dfc68316bef2ab7062ec
"ASoC: samsung: get access to DMA engine early to defer probe properly"
and indicated by a following compilation warning:

  CC [M]  sound/soc/samsung/spdif.o
sound/soc/samsung/spdif.c: In function ‘spdif_probe’:
sound/soc/samsung/spdif.c:419:6: warning: ‘filter’ may be used uninitialized
in this function [-Wuninitialized]

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/spdif.c

@@ -416,6 +416,15 @@ static int spdif_probe(struct platform_device *pdev)
 		goto err3;
 	}
 
+	spdif_stereo_out.addr_width = 2;
+	spdif_stereo_out.addr = mem_res->start + DATA_OUTBUF;
+	filter = NULL;
+	if (spdif_pdata) {
+		spdif_stereo_out.filter_data = spdif_pdata->dma_playback;
+		filter = spdif_pdata->dma_filter;
+	}
+	spdif->dma_playback = &spdif_stereo_out;
+
 	ret = samsung_asoc_dma_platform_register(&pdev->dev, filter,
 						 NULL, NULL);
 	if (ret) {
@@ -432,16 +441,6 @@ static int spdif_probe(struct platform_device *pdev)
 		goto err4;
 	}
 
-	spdif_stereo_out.addr_width = 2;
-	spdif_stereo_out.addr = mem_res->start + DATA_OUTBUF;
-	filter = NULL;
-	if (spdif_pdata) {
-		spdif_stereo_out.filter_data = spdif_pdata->dma_playback;
-		filter = spdif_pdata->dma_filter;
-	}
-
-	spdif->dma_playback = &spdif_stereo_out;
-
 	return 0;
 err4:
 	iounmap(spdif->regs);