Input: imx6ul_tsc - remove set but unused variable 'value'

Fixes the following W=1 kernel build warning(s):

 drivers/input/touchscreen/imx6ul_tsc.c: In function ‘adc_irq_fn’:
 drivers/input/touchscreen/imx6ul_tsc.c:307:6: warning: variable ‘value’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://lore.kernel.org/r/20201112110204.2083435-6-lee.jones@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/imx6ul_tsc.c

@@ -304,11 +304,10 @@ static irqreturn_t adc_irq_fn(int irq, void *dev_id)
 {
 	struct imx6ul_tsc *tsc = dev_id;
 	u32 coco;
-	u32 value;
 
 	coco = readl(tsc->adc_regs + REG_ADC_HS);
 	if (coco & 0x01) {
-		value = readl(tsc->adc_regs + REG_ADC_R0);
+		readl(tsc->adc_regs + REG_ADC_R0);
 		complete(&tsc->completion);
 	}