fdo#42155: Replace the only use of CAutoUnicodeBuffer part1

Change-Id: Id6ea78148b7689199540407518f6bcb25af4450d
Reviewed-on: https://gerrit.libreoffice.org/5713Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

fpicker/source/win32/misc/WinImplHelper.cxx

@@ -109,17 +109,17 @@ OUString SAL_CALL ListboxGetString( HWND hwnd, sal_Int32 aPosition )
         // without trailing '\0' that's why += 1
         lItem++;
 
-        CAutoUnicodeBuffer aBuff( lItem );
+        std::vector<sal_Unicode> vec(lItem);
 
         LRESULT lRet =
             SendMessageW(
                 hwnd, CB_GETLBTEXT, aPosition,
-                reinterpret_cast<LPARAM>(&aBuff) );
+                reinterpret_cast<LPARAM>(&vec[0]));
 
         OSL_ASSERT( lRet != CB_ERR );
 
         if ( CB_ERR != lRet )
-            aString = OUString( aBuff, lRet );
+            aString = OUString(&vec[0], lRet);
     }
 
     return aString;