Remove redundant "using" statement

Test: presubmit
Bug: 219872355
Change-Id: Ie4fc87e5231e31799644c26943bbc13000091e92
diff --git a/service/native/TrafficController.cpp b/service/native/TrafficController.cpp
index 393ee0a..3e98edb 100644
--- a/service/native/TrafficController.cpp
+++ b/service/native/TrafficController.cpp
@@ -65,7 +65,6 @@
 using netdutils::Status;
 using netdutils::statusFromErrno;
 using netdutils::StatusOr;
-using netdutils::status::ok;
 
 constexpr int kSockDiagMsgType = SOCK_DIAG_BY_FAMILY;
 constexpr int kSockDiagDoneMsgType = NLMSG_DONE;