Fix linter warnings in netd tests

Test: tests/runtests.sh
Change-Id: Id06480fa3c1fc04f5669c42b87b263b46bf614fd
diff --git a/server/InterfaceControllerTest.cpp b/server/InterfaceControllerTest.cpp
index fc5dce1..9f5c427 100644
--- a/server/InterfaceControllerTest.cpp
+++ b/server/InterfaceControllerTest.cpp
@@ -94,7 +94,7 @@
     }
 
     void expectSetProperty(const std::string& key, const std::string& val, Status status) {
-        EXPECT_CALL(mProperties, set(key, val)).WillOnce(Return(status));
+        EXPECT_CALL(mProperties, set(key, val)).WillOnce(Return(std::move(status)));
     }
 
     void expectWriteToFile(const Fd fd, const std::string& val, int err) {