dmaengine: dw: Unify ret-val local variables naming

Currently there are two names utilized in the driver to keep the functions
call status: ret and err. For the sake of unification convert to using the
first version only.

Signed-off-by: Serge Semin <[e-mail]>
Acked-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/dw/core.c

···
 	bool			autocfg = false;
 	unsigned int		dw_params;
 	unsigned int		i;
-	int			err;
+	int			ret;
 
 	dw->pdata = devm_kzalloc(chip->dev, sizeof(*dw->pdata), GFP_KERNEL);
 	if (!dw->pdata)
···
 
 		autocfg = dw_params >> DW_PARAMS_EN & 1;
 		if (!autocfg) {
-			err = -EINVAL;
+			ret = -EINVAL;
 			goto err_pdata;
 		}
 
···
 		pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
 		pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
 	} else if (chip->pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
-		err = -EINVAL;
+		ret = -EINVAL;
 		goto err_pdata;
 	} else {
 		memcpy(dw->pdata, chip->pdata, sizeof(*dw->pdata));
···
 	dw->chan = devm_kcalloc(chip->dev, pdata->nr_channels, sizeof(*dw->chan),
 				GFP_KERNEL);
 	if (!dw->chan) {
-		err = -ENOMEM;
+		ret = -ENOMEM;
 		goto err_pdata;
 	}
 
···
 					 sizeof(struct dw_desc), 4, 0);
 	if (!dw->desc_pool) {
 		dev_err(chip->dev, "No memory for descriptors dma pool\n");
-		err = -ENOMEM;
+		ret = -ENOMEM;
 		goto err_pdata;
 	}
 
 	tasklet_setup(&dw->tasklet, dw_dma_tasklet);
 
-	err = request_irq(chip->irq, dw_dma_interrupt, IRQF_SHARED,
+	ret = request_irq(chip->irq, dw_dma_interrupt, IRQF_SHARED,
 			  dw->name, dw);
-	if (err)
+	if (ret)
 		goto err_pdata;
 
 	INIT_LIST_HEAD(&dw->dma.channels);
···
 	 */
 	dma_set_max_seg_size(dw->dma.dev, dw->chan[0].block_size);
 
-	err = dma_async_device_register(&dw->dma);
-	if (err)
+	ret = dma_async_device_register(&dw->dma);
+	if (ret)
 		goto err_dma_register;
 
 	dev_info(chip->dev, "DesignWare DMA Controller, %d channels\n",
···
 	free_irq(chip->irq, dw);
 err_pdata:
 	pm_runtime_put_sync_suspend(chip->dev);
-	return err;
+	return ret;
 }
 
 int do_dma_remove(struct dw_dma_chip *chip)

drivers/dma/dw/platform.c

···
 	struct dw_dma_chip_pdata *data;
 	struct dw_dma_chip *chip;
 	struct device *dev = &pdev->dev;
-	int err;
+	int ret;
 
 	match = device_get_match_data(dev);
 	if (!match)
···
 	if (IS_ERR(chip->regs))
 		return PTR_ERR(chip->regs);
 
-	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-	if (err)
-		return err;
+	ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
 
 	if (!data->pdata)
 		data->pdata = dev_get_platdata(dev);
···
 	chip->clk = devm_clk_get_optional(chip->dev, "hclk");
 	if (IS_ERR(chip->clk))
 		return PTR_ERR(chip->clk);
-	err = clk_prepare_enable(chip->clk);
-	if (err)
-		return err;
+	ret = clk_prepare_enable(chip->clk);
+	if (ret)
+		return ret;
 
 	pm_runtime_enable(&pdev->dev);
 
-	err = data->probe(chip);
-	if (err)
+	ret = data->probe(chip);
+	if (ret)
 		goto err_dw_dma_probe;
 
 	platform_set_drvdata(pdev, data);
···
 err_dw_dma_probe:
 	pm_runtime_disable(&pdev->dev);
 	clk_disable_unprepare(chip->clk);
-	return err;
+	return ret;
 }
 
 static void dw_remove(struct platform_device *pdev)