[POWERPC] Use FIELD_SIZEOF in drivers/block/viodasd.c

Author: Julia Lawall <julia@diku.dk>

Robert P.J. Day proposed to use the macro FIELD_SIZEOF in replace of code
that matches its definition.

The modification was made using the following semantic patch
(http://www.emn.fr/x-info/coccinelle/)

// 
@haskernel@
@@

#include 

@depends on haskernel@
type t;
identifier f;
@@

- (sizeof(((t*)0)->f))
+ FIELD_SIZEOF(t, f)

@depends on haskernel@
type t;
identifier f;
@@

- sizeof(((t*)0)->f)
+ FIELD_SIZEOF(t, f)
// 

Signed-off-by: Julia Lawall 
Cc: Jens Axboe 
Cc: Benjamin Herrenschmidt 
Acked-by: Stephen Rothwell 
Signed-off-by: Andrew Morton 
Signed-off-by: Paul Mackerras 

---
 drivers/block/viodasd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index 41ca721..ebfe038 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -69,7 +69,7 @@ MODULE_LICENSE("GPL");
 enum {
 	PARTITION_SHIFT = 3,
 	MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS,
-	MAX_DISK_NAME = sizeof(((struct gendisk *)0)->disk_name)
+	MAX_DISK_NAME = FIELD_SIZEOF(struct gendisk, disk_name)
 };
 
 static DEFINE_SPINLOCK(viodasd_spinlock);