make the port 64-bit bar clean

Reference: /n/atom/patch/applied/igbe64bitport
Date: Thu Mar 27 05:11:06 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/etherigbe.c	Thu Mar 27 05:10:59 2014
+++ /sys/src/nix/k10/etherigbe.c	Thu Mar 27 05:11:01 2014
@@ -440,7 +440,7 @@
 
 typedef struct Ctlr Ctlr;
 typedef struct Ctlr {
-	int	port;
+	uintmem	port;
 	Pcidev*	pcidev;
 	Ctlr*	next;
 	Ether*	edev;