cnss2: Fix potential TME NULL pointer dereference

Fix potential NULL pointer dereference for tme_lite_mem
and tme_opt_file_mem, which are captured by static
analysis tool.

Change-Id: Ib2540669c55e771598dd21d8c2ae3eb297ffa67f
CRs-Fixed: 3716873

cnss2/pci.c

@@ -5077,6 +5077,9 @@ int cnss_pci_load_tme_opt_file(struct cnss_pci_data *pci_priv,
 		return 0;
 	}
 
+	if (!tme_lite_mem)
+		return 0;
+
 	if (!tme_lite_mem->va && !tme_lite_mem->size) {
 		cnss_pci_add_fw_prefix_name(pci_priv, filename,
 					    tme_opt_filename);