phy: qcom-ufs: Remove unnecessary BUG_ON

BUG_ON() are not preferred in the driver, plus the variable
on which BUG_ON is asserted is already checked in the code
before passing.
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/phy/phy-qcom-ufs.c

@@ -322,8 +322,6 @@ int ufs_qcom_phy_cfg_vreg(struct phy *phy,
 	struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(phy);
 	struct device *dev = ufs_qcom_phy->dev;
 
-	BUG_ON(!vreg);
-
 	if (regulator_count_voltages(reg) > 0) {
 		min_uV = on ? vreg->min_uV : 0;
 		ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);