batman: potential null dereference

drivers/staging/batman-adv/routing.c

    88          } else if ((orig_node->router = NULL) && (neigh_node != NULL)) {
                            ^^^^^^^^^^^^^^^^^^^^^^^^^
    89  
    90                  bat_dbg(DBG_ROUTES,
    91                          "Adding route towards: %pM (via %pM)\n",
    92                          orig_node->orig, neigh_node->addr);
    93                  hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
    94  
    95                  /* route changed */
    96          } else {
    97                  bat_dbg(DBG_ROUTES, "Changing route towards: %pM (now via %pM - was via %pM)\n", 
orig_node->orig, neigh_node->addr, orig_node->router->addr);
                                   ^^^^^^^^^^^^^^^^^^^^^^^									
    98          }

This could fail if debugging is enabled and neigh_node is null.

regards,
dan carpenter