error detection and memory leaks in c example

examples/simple_example.c

@@ -20,24 +20,28 @@ int main (int argc, char **argv) {
 	rocksdb_options_set_create_if_missing (options, 1);
 
 	// open DB
-	char *err;
+	char *err = NULL;
 	db = rocksdb_open (options, DBPath, &err);
-//	assert (!err);
+	assert (!err);
 
 	// Put key-value
 	rocksdb_writeoptions_t *writeoptions = rocksdb_writeoptions_create ();
 	const char key[] = "key";
 	char *value = "value";
 	rocksdb_put (db, writeoptions, key, strlen (key), value, strlen (value), &err);
-//	assert (!err);
+	assert (!err);
 	// Get value
 	rocksdb_readoptions_t *readoptions = rocksdb_readoptions_create ();
 	size_t len;
 	value = rocksdb_get (db, readoptions, key, strlen (key), &len, &err);
-//	assert (!err);
+	assert (!err);
 	assert (strcmp (value, "value") == 0);
 	free (value);
 
+	// cleanup
+	rocksdb_writeoptions_destroy (writeoptions);
+	rocksdb_readoptions_destroy (readoptions);
+	rocksdb_options_destroy (options);
 	rocksdb_close (db);
 
 	return 0;