crash in txn begin, commit

git-svn-id: file:///svn/tokudb@2263 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/test_txn_begin_commit.c

+#include <stdio.h>
+#include <assert.h>
+#include <sys/stat.h>
+#include <db.h>
+
+#include "test.h"
+
+int main(int argc, char *argv[]) {
+    int r;
+    DB_ENV *env;
+
+    system("rm -rf " DIR);
+    mkdir(DIR, 0777);
+
+    r = db_env_create(&env, 0); 
+    assert(r == 0);
+
+    r = env->open(env, DIR, DB_INIT_MPOOL + DB_INIT_LOG + DB_INIT_TXN + DB_PRIVATE + DB_CREATE, 0777); 
+    assert(r == 0);
+
+    DB_TXN *txn;
+    r = env->txn_begin(env, 0, &txn, 0);
+    assert(r == 0);
+
+    r = txn->commit(txn, 0); 
+    assert(r == 0);
+    
+r = env->close(env, 0); 
+    assert(r == 0);
+    return 0;
+}