fix(stdiscosrv): close file descriptor on flush error in write (#10615)

The error path after bw.Flush() failed referenced fd.Close without calling it, so the descriptor was not closed when flush failed.

Signed-off-by: Weixie Cui <cuiweixie@gmail.com>

cmd/stdiscosrv/database.go

@@ -306,7 +306,7 @@ func (s *inMemoryStore) write() (err error) {
 	}
 
 	if err := bw.Flush(); err != nil {
-		_ = fd.Close
+		_ = fd.Close()
 		return err
 	}
 	if err := fd.Close(); err != nil {