[PATCH] Fix 64bit warning/bug in farsync.c

[Andi Kleen <ak@xxxxxx>]

Fix obvious 64bit bug/warning in farsync.c

diff -u linux-2.5-cleanup/drivers/net/wan/farsync.c-o 
linux-2.5-cleanup/drivers/net/wan/farsync.c
--- linux-2.5-cleanup/drivers/net/wan/farsync.c-o       2003-08-04 
22:06:34.000000000 +0200
+++ linux-2.5-cleanup/drivers/net/wan/farsync.c 2003-12-02 16:50:08.040067224 
+0100
@@ -317,7 +317,7 @@
 };
 
 /* Calculate offset of a buffer object within the shared memory window */
-#define BUF_OFFSET(X)   ((unsigned int)&(((struct buf_window *)BFM_BASE)->X))
+#define BUF_OFFSET(X)   offsetof(struct buf_window, X)
 
 #pragma pack()