Resolves: fdo#57532 restrict page sanity check to non-storage chunks

Change-Id: I47c24131e95b9a8a691dbff4710869ba91df8306
(cherry picked from commit 4a104422)
Signed-off-by: Caolán McNamara <caolanm@redhat.com>

sot/source/sdstor/stgelem.cxx

@@ -389,7 +389,7 @@ sal_Bool StgEntry::Load( const void* pFrom, sal_uInt32 nBufSize )
     if (n > nMaxLegalStr)
         return sal_False;
 
-    if ((nSize < 0 && cType != STG_STORAGE) || (nPage1 < 0 && !isKnownSpecial(nPage1)))
+    if ((cType != STG_STORAGE) && ((nSize < 0) || (nPage1 < 0 && !isKnownSpecial(nPage1))))
     {
         // the size makes no sense for the substorage
         // TODO/LATER: actually the size should be an unsigned value, but in this case it would mean a stream of more than 2Gb