UBIFS: fix assertion warning

This patch fixes the following false assertion warning:

UBIFS assert failed in data_nodes_cmp at 130 (pid 15107)

The assertion was wrong because it did not take into account that the
node can be an xentry.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
1 file changed