xfs: remove a superflous assignment in xfs_iext_remove_node

Reported-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_iext_tree.c

@@ -751,7 +751,6 @@ again:
 
 		node = xfs_iext_rebalance_node(parent, &pos, node, nr_entries);
 		if (node) {
-			offset = node->keys[0];
 			victim = node;
 			node = parent;
 			goto again;