Tweak prev commit

If somehow "need" is larger than the list size, don't
try to fake out the dirty list.

libraries/liblmdb/mdb.c

@@ -1479,7 +1479,6 @@ mdb_page_spill(MDB_cursor *m0, MDB_val *key, MDB_val *data)
 	 * better than 1/2, 1/4, or 1/10.
 	 */
 	k = 0;
-	need *= 100;
 	if (need < MDB_IDL_UM_MAX / 8)
 		need = MDB_IDL_UM_MAX / 8;
 
@@ -1519,22 +1518,27 @@ mdb_page_spill(MDB_cursor *m0, MDB_val *key, MDB_val *data)
 	 */
 	{
 		MDB_ID2 old;
+		if (i) {
 			k = dl[0].mid - i + 1;
 			old = dl[i-1];
 			dl[i-1].mid = k;
 			txn->mt_u.dirty_list = &dl[i-1];
+		}
 
 		rc = mdb_page_flush(txn);
 
+		if (i) {
 			/* reset back to the real list */
 			dl[0].mid -= k;
 			dl[0].mid += dl[i-1].mid;
 			dl[i-1] = old;
 			txn->mt_u.dirty_list = dl;
 		}
+	}
 
 	mdb_cursorpages_mark(m0, P_DIRTY|P_KEEP);
 
+	if (i) {
 		/* Reset any dirty root pages we kept that page_flush didn't see */
 		for (i=0; i<txn->mt_numdbs; i++) {
 			if (txn->mt_dbflags[i] & DB_DIRTY) {
@@ -1547,6 +1551,7 @@ mdb_page_spill(MDB_cursor *m0, MDB_val *key, MDB_val *data)
 					dp->mp_flags ^= P_KEEP;
 			}
 		}
+	}
 
 done:
 	if (rc == 0) {