dmaengine: fsl-dpaa2-qdma: remove set but not used variable 'dpaa2_qdma'

drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c: In function dpaa2_qdma_shutdown:
drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c:795:28: warning: variable dpaa2_qdma set but not used [-Wunused-but-set-variable]

commit 3e0ca3c3 ("dmaengine: fsl-dpaa2-qdma: Adding shutdown hook")
involved this, remove it.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20200303131347.28392-1-yuehaibing@huawei.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c

@@ -792,13 +792,11 @@ static int dpaa2_qdma_remove(struct fsl_mc_device *ls_dev)
 
 static void dpaa2_qdma_shutdown(struct fsl_mc_device *ls_dev)
 {
-	struct dpaa2_qdma_engine *dpaa2_qdma;
 	struct dpaa2_qdma_priv *priv;
 	struct device *dev;
 
 	dev = &ls_dev->dev;
 	priv = dev_get_drvdata(dev);
-	dpaa2_qdma = priv->dpaa2_qdma;
 
 	dpdmai_disable(priv->mc_io, 0, ls_dev->mc_handle);
 	dpaa2_dpdmai_dpio_unbind(priv);