hwmon: pm8xxx-adc: Fix setting disable bit for CNTRL register

Fix setting the disable bit in the BTM end routing by
writing 0 to the BTM control register.

Change-Id: Ic51664f7f5703dc314c5e46240dd18a001f764f1
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
diff --git a/drivers/hwmon/pm8xxx-adc.c b/drivers/hwmon/pm8xxx-adc.c
index 5da80d9..6b3aa0c 100644
--- a/drivers/hwmon/pm8xxx-adc.c
+++ b/drivers/hwmon/pm8xxx-adc.c
@@ -974,22 +974,14 @@
 {
 	struct pm8xxx_adc *adc_pmic = pmic_adc;
 	int i, rc;
-	u8 data_arb_btm_cntrl;
+	u8 data_arb_btm_cntrl = 0;
 	unsigned long flags;
 
 	disable_irq_nosync(adc_pmic->btm_warm_irq);
 	disable_irq_nosync(adc_pmic->btm_cool_irq);
 
 	spin_lock_irqsave(&adc_pmic->btm_lock, flags);
-	/* Set BTM registers to Disable mode */
-	rc = pm8xxx_adc_read_reg(PM8XXX_ADC_ARB_BTM_CNTRL1,
-						&data_arb_btm_cntrl);
-	if (rc < 0) {
-		spin_unlock_irqrestore(&adc_pmic->btm_lock, flags);
-		return rc;
-	}
 
-	data_arb_btm_cntrl |= ~PM8XXX_ADC_ARB_BTM_CNTRL1_EN_BTM;
 	/* Write twice to the CNTRL register for the arbiter settings
 	   to take into effect */
 	for (i = 0; i < 2; i++) {