Cppcheck: release the handle that CreateThread returns

Change-Id: I4d6d04873d69d2ff1e5409372b353e0bb9a5d68d
Reviewed-on: https://gerrit.libreoffice.org/60120
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

dtrans/test/win32/dnd/atlwindow.cxx

@@ -181,7 +181,7 @@ LRESULT AWindow::OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled
 
                 data.evtThreadReady= CreateEvent( NULL, FALSE, FALSE, NULL);
 
-                HANDLE hThread= CreateThread( NULL, 0, MTAFunc, &data, 0, &mtaThreadId);
+                CloseHandle(CreateThread(NULL, 0, MTAFunc, &data, 0, &mtaThreadId));
                 // We must wait until the thread copied the ThreadData structure
                 WaitForSingleObject( data.evtThreadReady, INFINITE);
                 CloseHandle( data.evtThreadReady);

sal/osl/w32/dllentry.cxx

@@ -221,13 +221,17 @@ BOOL WINAPI DllMain( HINSTANCE, DWORD fdwReason, LPVOID )
                 {
                     // No error check, it works or it does not
                     // Thread should only be started for headless mode, see desktop/win32/source/officeloader.cxx
-                    CreateThread( nullptr, 0, ParentMonitorThreadProc, reinterpret_cast<LPVOID>(dwParentProcessId), 0, &dwThreadId );
+                    HANDLE hThread
+                        = CreateThread(nullptr, 0, ParentMonitorThreadProc,
+                                       reinterpret_cast<LPVOID>(dwParentProcessId), 0, &dwThreadId);
                     // Note: calling CreateThread in DllMain is discouraged
                     // but this is only done in the headless mode and in
                     // that case no other threads should be running at startup
                     // when sal3.dll is loaded; also there is no
                     // synchronization with the spawned thread, so there
                     // does not appear to be a real risk of deadlock here
+                    if (hThread)
+                        CloseHandle(hThread);
                 }
             }
 

sfx2/source/appl/shutdowniconw32.cxx

@@ -528,7 +528,7 @@ void win32_init_sys_tray()
             );
 
         DWORD   dwThreadId;
-        CreateThread( nullptr, 0, SystrayThread, nullptr, 0, &dwThreadId );
+        CloseHandle(CreateThread(nullptr, 0, SystrayThread, nullptr, 0, &dwThreadId));
     }
 }