iio: adc: exynos: drop unneeded variable assignment

The initialization of 'ret' variable in probe function is shortly after
overwritten.  This initialization is simply not used.

Addresses-Coverity: Unused value
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20210410164728.8096-1-krzysztof.kozlowski@canonical.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/exynos_adc.c

@@ -794,7 +794,7 @@ static int exynos_adc_probe(struct platform_device *pdev)
 	struct s3c2410_ts_mach_info *pdata = dev_get_platdata(&pdev->dev);
 	struct iio_dev *indio_dev = NULL;
 	bool has_ts = false;
-	int ret = -ENODEV;
+	int ret;
 	int irq;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct exynos_adc));