[via-rhine] Fix erroneous uses of memory I/O instead of port I/O

src/drivers/net/via-rhine.c

 
     printf ("rhine disable\n");
     /* Switch to loopback mode to avoid hardware races. */
-    writeb(0x60 | 0x01, byTCR);
+    outb(0x60 | 0x01, byTCR);
     /* Stop the chip's Tx and Rx processes. */
-    writew(CR_STOP, byCR0);
+    outw(CR_STOP, byCR0);
 }
 
 /**************************************************************************
     outw (0, byIMR0);
 }
 /* Beware of PCI posted writes */
-#define IOSYNC  do { readb(nic->ioaddr + StationAddr); } while (0)
+#define IOSYNC  do { inb(nic->ioaddr + StationAddr); } while (0)
 
 static int
 rhine_poll (struct nic *nic, int retreive)