qcacmn: Add NULL check for find IE API

Ensure that the IE pointer is not dereferenced if the pointer
passed to the function is NULL.

CRs-Fixed: 2724504
Change-Id: Ie6b4c633e252de5162c9f7ab72c2ea4a2cc058dd

umac/scan/dispatcher/src/wlan_scan_utils_api.c

@@ -1651,13 +1651,15 @@ util_scan_gen_scan_entry(struct wlan_objmgr_pdev *pdev,
  * @ies: pointer consisting of IEs
  * @len: IE length
  *
- * Return: NULL if the element ID is not found or
- * a pointer to the first byte of the requested
- * element
+ * Return: NULL if the element ID is not found or if IE pointer is NULL else
+ * pointer to the first byte of the requested element
  */
 static uint8_t *util_scan_find_ie(uint8_t eid, uint8_t *ies,
 				  int32_t len)
 {
+	if (!ies)
+		return NULL;
+
 	while (len >= 2 && len >= ies[1] + 2) {
 		if (ies[0] == eid)
 			return ies;