loplugin:useuniqueptr in X11SalData

Change-Id: I61a6d5cc5690a2899986ec831655e480a1f414d1
Reviewed-on: https://gerrit.libreoffice.org/53360
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

vcl/inc/unx/saldata.hxx

@@ -56,7 +56,7 @@ class VCLPLUG_GEN_PUBLIC X11SalData : public GenericUnixSalData
     XIOErrorHandler m_aOrigXIOErrorHandler;
 
 protected:
-    SalXLib      *pXLib_;
+    std::unique_ptr<SalXLib>  pXLib_;
 
 public:
              X11SalData( GenericUnixSalDataType t, SalInstance *pInstance );
@@ -70,7 +70,7 @@ public:
 
     void                    DeleteDisplay(); // for shutdown
 
-    SalXLib*        GetLib() const { return pXLib_; }
+    SalXLib*                GetLib() const { return pXLib_.get(); }
 
     static void             Timeout();
 

vcl/unx/generic/app/saldata.cxx

@@ -270,13 +270,12 @@ void X11SalData::DeleteDisplay()
 {
     delete GetDisplay();
     SetDisplay( nullptr );
-    delete pXLib_;
-    pXLib_ = nullptr;
+    pXLib_.reset();
 }
 
 void X11SalData::Init()
 {
-    pXLib_ = new SalXLib();
+    pXLib_.reset(new SalXLib());
     pXLib_->Init();
 }