[patch] ocfs2: silence an integer overflow warning

[Dan Carpenter]

My static checker complains that ->me_start + ->me_len can overflow.
I haven't followed it through to see the implications but it seems
simple enough to prevent the overflow.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
move_extents in other less common file systems have this same warning as
well.

diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index e3d05d9..9ff405a 100644
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -1014,7 +1014,8 @@ int ocfs2_ioctl_move_extents(struct file *filp, void 
__user *argp)
                goto out_free;
        }
 
-       if (range.me_start > i_size_read(inode)) {
+       if (range.me_start > i_size_read(inode) ||
+           range.me_len > i_size_read(inode)) {
                status = -EINVAL;
                goto out_free;
        }