[PATCH] s2io build fix

Damir Perisa <damir.perisa@solnet.ch> reports:

 drivers/net/s2io.h:765: error: invalid lvalue in assignment
 drivers/net/s2io.h:766: error: invalid lvalue in assignment

That's a gcc4 error.  I don't see why the casts are there anyway..

Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

drivers/net/s2io.h

@@ -762,8 +762,8 @@ static inline u64 readq(void __iomem *addr)
 {
 	u64 ret = 0;
 	ret = readl(addr + 4);
-	(u64) ret <<= 32;
-	(u64) ret |= readl(addr);
+	ret <<= 32;
+	ret |= readl(addr);
 
 	return ret;
 }