fix AsyncStatement::close()

Author: nakagami

firebirdsql/aio/fbcore.py

@@ -154,7 +154,7 @@ async def prepare(self, sql, explain_plan=False):
     async def close(self):
         DEBUG_OUTPUT("AsyncStatement::close()", self.handle)
         if self.stmt_type == isc_info_sql_stmt_select and self._is_open:
-            self.trans.connection._op_free_statement(self.handle, DSQL_close)
+            await self.trans.connection._async_op_free_statement(self.handle, DSQL_close)
             if (self.trans.connection.accept_type & ptype_MASK) == ptype_lazy_send:
                 self.trans.connection.lazy_response_count += 1
             else:

firebirdsql/tests/test_async.py

@@ -63,7 +63,7 @@ async def _test_select():
             result = await cur.fetchall()
             self.assertEqual(result, [(42, ), ])
             await cur.close()
-            conn.close()
+            await conn.close()
         loop.run_until_complete(_test_select())
         loop.close()