msm: camera: sensor: TOCTOU error handling

- Change to dereference s_ctrl only after proper
  NULL Dereference Check.

CRs-Fixed: 3875406
Change-Id: I8e2c717b22efff2a7d6503d38c048e30eff230da
Signed-off-by: Swami Reddy Reddy <quic_swamired@quicinc.com>

Author: Swami Reddy Reddy

techpack/camera/drivers/cam_sensor_module/cam_sensor/cam_sensor_core.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
- * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2023-2024, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/module.h>
@@ -787,13 +787,14 @@ int32_t cam_sensor_driver_cmd(struct cam_sensor_ctrl_t *s_ctrl,
 	int rc = 0, pkt_opcode = 0;
 	int8_t retries = 3;
 	struct cam_control *cmd = (struct cam_control *)arg;
-	struct cam_sensor_power_ctrl_t *power_info =
-		&s_ctrl->sensordata->power_info;
+	struct cam_sensor_power_ctrl_t *power_info = NULL;
 	if (!s_ctrl || !arg) {
 		CAM_ERR(CAM_SENSOR, "s_ctrl is NULL");
 		return -EINVAL;
 	}
 
+	power_info = &s_ctrl->sensordata->power_info;
+
 	if (cmd->op_code != CAM_SENSOR_PROBE_CMD) {
 		if (cmd->handle_type != CAM_HANDLE_USER_POINTER) {
 			CAM_ERR(CAM_SENSOR, "Invalid handle type: %d",