xfs: fix number of records handling in xfs_iext_split_leaf

Fix to check the correct value, and remove a duplicate handling of the
uneven record number split algorith,

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

@@ -555,16 +555,13 @@ xfs_iext_split_leaf(
 	int			i;
 
 	/* for sequential append operations just spill over into the new node */
-	if (cur->pos == KEYS_PER_NODE) {
+	if (cur->pos == RECS_PER_LEAF) {
 		cur->leaf = new;
 		cur->pos = 0;
 		*nr_entries = 0;
 		goto done;
 	}
 
-	if (nr_keep & 1)
-		nr_keep++;
-
 	for (i = 0; i < nr_move; i++) {
 		new->recs[i] = leaf->recs[nr_keep + i];
 		xfs_iext_rec_clear(&leaf->recs[nr_keep + i]);