ceph: fix printing wrong return variable in ceph_direct_read_write()

Fix printing wrong return variable for invalidate_inode_pages2_range in
ceph_direct_read_write().
Signed-off-by: NZhi Zhang <zhang.david2011@gmail.com>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>

fs/ceph/file.c

@@ -906,7 +906,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
 					pos >> PAGE_SHIFT,
 					(pos + count) >> PAGE_SHIFT);
 		if (ret2 < 0)
-			dout("invalidate_inode_pages2_range returned %d\n", ret);
+			dout("invalidate_inode_pages2_range returned %d\n", ret2);
 
 		flags = CEPH_OSD_FLAG_ORDERSNAP |
 			CEPH_OSD_FLAG_ONDISK |