Reduce OUString operations

Change-Id: I11f9205e82dff9df5b235860df1b36d266d17334
Reviewed-on: https://gerrit.libreoffice.org/66221
Tested-by: Jenkins
Reviewed-by: Matteo Casalin <matteo.casalin@yahoo.com>

desktop/source/deployment/misc/dp_descriptioninfoset.cxx

@@ -473,8 +473,7 @@ css::uno::Sequence< OUString > DescriptionInfoset::getSupportedPlatforms() const
     sal_Int32 nIndex = 0;
     do
     {
-        OUString aToken = value.getToken( 0, ',', nIndex );
-        aToken = aToken.trim();
+        const OUString aToken = value.getToken( 0, ',', nIndex ).trim();
         if (!aToken.isEmpty())
             vec.push_back(aToken);