Fix this sparse warnings:
  drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness)
  drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness)
  drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness)
  drivers/net/ns83820.c:479:36: 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>
 struct rx_info {
        spinlock_t      lock;
        int             up;
-       long            idle;
+       unsigned long   idle;
 
        struct sk_buff  *skbs[NR_RX_DESC];