Staging: mt7621-dma: Remove braces around single if statement

Fix following checkpatch.pl warning by removing unnecessary braces:
WARNING: braces {} are not necessary for single statement blocks
Signed-off-by: NPuranjay Mohan <puranjay12@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-dma/mtk-hsdma.c

@@ -664,9 +664,8 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
 		return -EINVAL;
 
 	hsdma = devm_kzalloc(&pdev->dev, sizeof(*hsdma), GFP_KERNEL);
-	if (!hsdma) {
+	if (!hsdma)
 		return -EINVAL;
-	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(&pdev->dev, res);