net: eepro100: Fix build warnings

When building katmai, it reports quite a lot

  warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

Fix this by casting the dev->iobase with u_long.
Signed-off-by: NBin Meng <bmeng.cn@gmail.com>
Acked-by: NJoe Hershberger <joe.hershberger@ni.com>

drivers/net/eepro100.c

@@ -240,23 +240,23 @@ static void eepro100_halt (struct eth_device *dev);
 
 static inline int INW (struct eth_device *dev, u_long addr)
 {
-	return le16_to_cpu (*(volatile u16 *) (addr + dev->iobase));
+	return le16_to_cpu(*(volatile u16 *)(addr + (u_long)dev->iobase));
 }
 
 static inline void OUTW (struct eth_device *dev, int command, u_long addr)
 {
-	*(volatile u16 *) ((addr + dev->iobase)) = cpu_to_le16 (command);
+	*(volatile u16 *)((addr + (u_long)dev->iobase)) = cpu_to_le16(command);
 }
 
 static inline void OUTL (struct eth_device *dev, int command, u_long addr)
 {
-	*(volatile u32 *) ((addr + dev->iobase)) = cpu_to_le32 (command);
+	*(volatile u32 *)((addr + (u_long)dev->iobase)) = cpu_to_le32(command);
 }
 
 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 static inline int INL (struct eth_device *dev, u_long addr)
 {
-	return le32_to_cpu (*(volatile u32 *) (addr + dev->iobase));
+	return le32_to_cpu(*(volatile u32 *)(addr + (u_long)dev->iobase));
 }
 
 static int get_phyreg (struct eth_device *dev, unsigned char addr,