mfd: jz4740-adc: Remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure, since commit 0998d063
(device-core: Ensure drvdata = NULL when no driver is bound).
Thus, it is not needed to manually clear the device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/jz4740-adc.c

@@ -294,7 +294,6 @@ static int jz4740_adc_probe(struct platform_device *pdev)
 err_clk_put:
 	clk_put(adc->clk);
 err_iounmap:
-	platform_set_drvdata(pdev, NULL);
 	iounmap(adc->base);
 err_release_mem_region:
 	release_mem_region(adc->mem->start, resource_size(adc->mem));
@@ -317,8 +316,6 @@ static int jz4740_adc_remove(struct platform_device *pdev)
 
 	clk_put(adc->clk);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }