mhPrevInst was pointless

Change-Id: Iacd1c0856f991e11ef26d7ff6bf1e75264b89ac9

vcl/inc/win/saldata.hxx

@@ -74,7 +74,6 @@ public:
 
 public:
     HINSTANCE               mhInst;                 // default instance handle
-    HINSTANCE               mhPrevInst;             // previous instance handle
     int                     mnCmdShow;              // default frame show style
     HPALETTE                mhDitherPal;            // dither palette
     HGLOBAL                 mhDitherDIB;            // dither memory handle

vcl/win/source/app/salinst.cxx

@@ -332,7 +332,6 @@ void SalData::initKeyCodeMap()
 SalData::SalData()
 {
     mhInst = 0;                 // default instance handle
-    mhPrevInst = 0;             // previous instance handle
     mnCmdShow = 0;              // default frame show style
     mhDitherPal = 0;            // dither palette
     mhDitherDIB = 0;            // dither memory handle
@@ -435,7 +434,6 @@ void InitSalMain()
         aSI.cb = sizeof( aSI );
         GetStartupInfo( &aSI );
         pData->mhInst                   = GetModuleHandle( NULL );
-        pData->mhPrevInst               = NULL;
         pData->mnCmdShow                = aSI.wShowWindow;
     }
 }
@@ -464,8 +462,6 @@ SalInstance* CreateSalInstance()
     pSalData->mnAppThreadId = GetCurrentThreadId();
 
     // register frame class
-    if ( !pSalData->mhPrevInst )
-    {
     WNDCLASSEXW aWndClassEx;
     aWndClassEx.cbSize          = sizeof( aWndClassEx );
     aWndClassEx.style           = CS_OWNDC;
@@ -501,7 +497,6 @@ SalInstance* CreateSalInstance()
     aWndClassEx.lpszClassName   = SAL_COM_CLASSNAMEW;
     if ( !RegisterClassExW( &aWndClassEx ) )
         return NULL;
-    }
 
     HWND hComWnd = CreateWindowExW( WS_EX_TOOLWINDOW, SAL_COM_CLASSNAMEW,
                                L"", WS_POPUP, 0, 0, 0, 0, 0, 0,