pnfs/objlayout: fix endianess annotation in objio_alloc_deviceid_node

The kbuild test robot complained about a new sparse warning in
objio_alloc_deviceid_node, but it turns out that this was just a moved
reference to an existing variable.  Fix it to have the right big endian
annotated type.

Note that there are some other endianess issues in this file that I didn't
bother to sort out as they involve global headers.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/objlayout/objio_osd.c

@@ -93,7 +93,7 @@ objio_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
 	struct osd_dev *od;
 	struct osd_dev_info odi;
 	bool retry_flag = true;
-	u32 *p;
+	__be32 *p;
 	int err;
 
 	deviceaddr = kzalloc(sizeof(*deviceaddr), gfp_flags);