Fix sparse warning:
  drivers/net/wireless/prism54/isl_ioctl.c:2997:32: warning: incorrect type in argument 2 (different signedness)
  drivers/net/wireless/prism54/oid_mgt.c:712:42: warning: incorrect type in argument 2 (different signedness)
Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
                union iwreq_data *uwrq, char *extra)
 {
        islpci_private *priv = netdev_priv(ndev);
-       u32 u, oid = OID_INL_CONFIG;
+       u32 u;
+       enum oid_num_t oid = OID_INL_CONFIG;
 
        down_write(&priv->mib_sem);
        mgt_get(priv, OID_INL_CONFIG, &u);
 
 mgt_commit(islpci_private *priv)
 {
        int rvalue;
-       u32 u;
+       enum oid_num_t u;
 
        if (islpci_get_state(priv) < PRV_STATE_INIT)
                return 0;