LanguageClient: Make sure to run callback in all code paths

... when receiving a reply for textDocument/definition.

Change-Id: I08f3a22f7c39a33b7b84539125a76d0c0d625692
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangcodemodel/test/clangdtests.cpp

@@ -506,9 +506,6 @@ void ClangdTestLocalReferences::test()
     client()->findLocalUsages(doc, cursor, std::move(handler));
     timer.start(10000);
     loop.exec();
-    QEXPECT_FAIL("cursor not on identifier", "clangd bug: go to definition does not return", Abort);
-    QEXPECT_FAIL("template parameter member access",
-                 "clangd bug: go to definition does not return", Abort);
     QVERIFY(timer.isActive());
     timer.stop();