ovsdb-data: Drop redundant initialization from ovsdb_datum_apply_diff().
The call to ovsdb_datum_diff() initializes 'new', so it's not necessary to
also do it in ovsdb_datum_apply_diff().
Found by inspection.
@@ -2121,7 +2121,6 @@ ovsdb_datum_apply_diff(struct ovsdb_datum *new,
const struct ovsdb_datum *diff,
const struct ovsdb_type *type)
{
- ovsdb_datum_init_empty(new);
ovsdb_datum_diff(new, old, diff, type);
/* Make sure member size of 'new' conforms to type. */
