[t:5144], do not prepare transactions that need to be aborted

git-svn-id: file:///svn/toku/tokudb@44967 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/threaded_stress_test_helpers.h

@@ -546,7 +546,7 @@ static void *worker(void *arg_v) {
             r = env->txn_begin(env, 0, &txn, arg->txn_type); CKERR(r);
         }
         r = arg->operation(txn, arg, arg->operation_extra, we->counters);
-        if (!arg->cli->single_txn && arg->do_prepare) {
+        if (r==0 && !arg->cli->single_txn && arg->do_prepare) {
             u_int8_t gid[DB_GID_SIZE];
             memset(gid, 0, DB_GID_SIZE);
             u_int64_t gid_val = txn->id64(txn);