TrafficControllerTest - trivial simplification

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I25158126c968707f44f595f731547a8bd9bb503d
diff --git a/service/native/TrafficControllerTest.cpp b/service/native/TrafficControllerTest.cpp
index 55912f4..afb5568 100644
--- a/service/native/TrafficControllerTest.cpp
+++ b/service/native/TrafficControllerTest.cpp
@@ -669,7 +669,7 @@
     BpfMap<uint64_t, UidTagValue> mCookieTagMap;
 
     void SetUp() {
-        mCookieTagMap.reset(android::bpf::mapRetrieveRW(COOKIE_TAG_MAP_PATH));
+        mCookieTagMap.init(COOKIE_TAG_MAP_PATH);
         ASSERT_TRUE(mCookieTagMap.isValid());
     }