asoc: codecs: Add nullptr check

fix for nullptr deref issue

Change-Id: I55b49354b17bcf32e6bd4651c297a8fd71dc68c2
Signed-off-by: Shazmaan Ali <[email protected]>

soc/pinctrl-lpi.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/gpio.h>
@@ -266,12 +267,13 @@ static int lpi_gpio_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
 
 	pad = pctldev->desc->pins[pin].drv_data;
 
-	pad->function = function;
-
-	val = lpi_gpio_read(pad, LPI_GPIO_REG_VAL_CTL);
-	val &= ~(LPI_GPIO_REG_FUNCTION_MASK);
-	val |= pad->function << LPI_GPIO_REG_FUNCTION_SHIFT;
-	lpi_gpio_write(pad, LPI_GPIO_REG_VAL_CTL, val);
+	if (pad != NULL) {
+		pad->function = function;
+		val = lpi_gpio_read(pad, LPI_GPIO_REG_VAL_CTL);
+		val &= ~(LPI_GPIO_REG_FUNCTION_MASK);
+		val |= pad->function << LPI_GPIO_REG_FUNCTION_SHIFT;
+		lpi_gpio_write(pad, LPI_GPIO_REG_VAL_CTL, val);
+	}
 	return 0;
 }