branches/zip: btr_cur_pessimistic_insert(): When calling

btr_cur_optimistic_insert(), pass big_rec to it, so that
the field references of externally stored columns (BLOB pointers)
will not be left uninitialized after a successful optimistic insert.
This bug was spotted by Sunny.

btr/btr0cur.c

@@ -1267,7 +1267,7 @@ btr_cur_pessimistic_insert(
 	cursor->flag = BTR_CUR_BINARY;
 
 	err = btr_cur_optimistic_insert(flags, cursor, entry, rec,
-					&big_rec_vec, n_ext, thr, mtr);
+					big_rec, n_ext, thr, mtr);
 	if (err != DB_FAIL) {
 
 		return(err);