staging: mt7621-mmc: Remove initialisation in msdc_dma_config

Current code initialises the variable sg at the beginning of the
msdc_dma_config function. This is not necessary, because the variable
is assigned by the for_each_sg macro later on.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -1091,7 +1091,7 @@ static int msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
 	void __iomem *base = host->base;
 	//u32 i, j, num, bdlen, arg, xfersz;
 	u32 j, num;
-	struct scatterlist *sg = dma->sg;
+	struct scatterlist *sg;
 	struct gpd *gpd;
 	struct bd *bd;