NFS: Fix a compile glitch on 64-bit systems

fs/nfs/pagelist.c:226: error: conflicting types for 'nfs_pageio_init'
include/linux/nfs_page.h:80: error: previous declaration of 'nfs_pageio_init' was here

Thanks to Andrew for spotting this...
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/pagelist.c

@@ -228,7 +228,7 @@ nfs_wait_on_request(struct nfs_page *req)
 void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
 		     struct inode *inode,
 		     int (*doio)(struct inode *, struct list_head *, unsigned int, size_t, int),
-		     unsigned int bsize,
+		     size_t bsize,
 		     int io_flags)
 {
 	INIT_LIST_HEAD(&desc->pg_list);