fix warning and redefinition error (#49)

librocksdb_sys/src/lib.rs

@@ -258,7 +258,6 @@ extern "C" {
     pub fn crocksdb_options_set_wal_recovery_mode(options: *mut DBOptions, mode: DBRecoveryMode);
     pub fn crocksdb_options_set_max_subcompactions(options: *mut DBOptions, v: size_t);
     pub fn crocksdb_options_set_wal_bytes_per_sync(options: *mut DBOptions, v: u64);
-    pub fn crocksdb_options_set_bytes_per_sync(options: *mut DBOptions, v: u64);
     pub fn crocksdb_options_enable_statistics(options: *mut DBOptions);
     pub fn crocksdb_options_statistics_get_string(options: *mut DBOptions) -> *const c_char;
     pub fn crocksdb_options_statistics_get_ticker_count(options: *mut DBOptions,

tests/test_rocksdb_options.rs

@@ -141,8 +141,8 @@ fn test_sync_wal() {
     let mut opts = Options::new();
     opts.create_if_missing(true);
     let db = DB::open(opts, path.path().to_str().unwrap()).unwrap();
-    db.put(b"key", b"value");
-    db.sync_wal();
+    db.put(b"key", b"value").unwrap();
+    db.sync_wal().unwrap();
     drop(db);
 }