ofz#5747 short->sal_Int32 like in StgDataStrm

Change-Id: I254c00b1142d7187beabe5d18532efec036de494
Reviewed-on: https://gerrit.libreoffice.org/48757Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
(cherry picked from commit 59cf6c61)

sot/source/sdstor/stgstrms.cxx

@@ -1047,7 +1047,7 @@ sal_Int32 StgSmallStrm::Read( void* pBuf, sal_Int32 n )
     // small stream is likely to be < 64 KBytes.
     if( ( m_nPos + n ) > m_nSize )
         n = m_nSize - m_nPos;
-    short nDone = 0;
+    sal_Int32 nDone = 0;
     while( n )
     {
         short nBytes = m_nPageSize - m_nOffset;
@@ -1078,7 +1078,7 @@ sal_Int32 StgSmallStrm::Write( const void* pBuf, sal_Int32 n )
 {
     // you can safely assume that reads are not huge, since the
     // small stream is likely to be < 64 KBytes.
-    short nDone = 0;
+    sal_Int32 nDone = 0;
     if( ( m_nPos + n ) > m_nSize )
     {
         sal_Int32 nOld = m_nPos;