ITS#7661 mdb_dbi_flags(): Allow main DBI

libraries/liblmdb/mdb.c

@@ -7903,7 +7903,7 @@ void mdb_dbi_close(MDB_env *env, MDB_dbi dbi)
 int mdb_dbi_flags(MDB_env *env, MDB_dbi dbi, unsigned int *flags)
 {
 	/* We could return the flags for the FREE_DBI too but what's the point? */
-	if (dbi <= MAIN_DBI || dbi >= env->me_numdbs)
+	if (dbi < MAIN_DBI || dbi >= env->me_numdbs)
 		return EINVAL;
 	*flags = env->me_dbflags[dbi];
 	return MDB_SUCCESS;