Fix uses of variables before their lifetimes begin

All of those have been broken with recent loplugin:sequentialassign changes (and
have been found with a new plugin to be commited).

The code in SbUnoClass::Find (basic/source/classes/sbunoobj.cxx) looks
suspicious, but has been effectively like that ever since at least
c25ec060 "initial import", so just marked it
with a TODO comment for now.

Change-Id: I0d691cb55ef317cf2b16b0490169de7ec97375cf
Reviewed-on: https://gerrit.libreoffice.org/70874
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

basic/source/classes/sbunoobj.cxx

@@ -3328,7 +3328,7 @@ SbxVariable* SbUnoClass::Find( const OUString& rName, SbxClassType )
             {
                 try
                 {
-                    Any aAny = xField->get( aAny );
+                    Any aAny = xField->get( {} ); //TODO: does this make sense?
 
                     // Convert to Sbx
                     pRes = new SbxVariable( SbxVARIANT );

chart2/source/controller/main/ChartController_Tools.cxx

@@ -255,7 +255,7 @@ void ChartController::executeDispatch_Paste()
     {
         Graphic aGraphic;
         // paste location: center of window
-        Point aPos = pChartWindow->PixelToLogic( tools::Rectangle( aPos, pChartWindow->GetSizePixel()).Center());
+        Point aPos = pChartWindow->PixelToLogic( tools::Rectangle( {}, pChartWindow->GetSizePixel()).Center());
 
         // handle different formats
         TransferableDataHelper aDataHelper( TransferableDataHelper::CreateFromSystemClipboard( pChartWindow ));

toolkit/source/controls/dialogcontrol.cxx

@@ -1054,7 +1054,7 @@ void UnoFrameControl::ImplSetPosSize( Reference< XControl >& rxCtrl )
         if ( pOutDev )
         {
             // Adjust Y based on height of Title
-            ::tools::Rectangle aRect = pOutDev->GetTextRect( aRect, sTitle );
+            ::tools::Rectangle aRect = pOutDev->GetTextRect( {}, sTitle );
             nY = nY + ( aRect.GetHeight() / 2 );
         }
         else

tools/source/generic/b3dtrans.cxx

@@ -449,7 +449,7 @@ void B3dCamera::CalcFocalLength()
     double fWidth = GetDeviceRectangleWidth();
 
     // Adjust focal length based on given position
-    basegfx::B3DPoint aOldPosition = WorldToEyeCoor(aOldPosition);
+    basegfx::B3DPoint aOldPosition = WorldToEyeCoor({});
     if(fWidth != 0.0)
         fFocalLength = aOldPosition.getZ() / fWidth * 35.0;
     if(fFocalLength < 5.0)