drop old SetBufferSize stuff

Change-Id: I16fc145a4d6378b1ca47cdd24caac9a8da913715
Reviewed-on: https://gerrit.libreoffice.org/43854Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/filter/excel/excel.cxx

@@ -121,8 +121,6 @@ ErrCode ScFormatFilterPluginImpl::ScImportExcel( SfxMedium& rMedium, ScDocument*
     ErrCode eRet = SCERR_IMPORT_UNKNOWN_BIFF;
     if( pBookStrm )
     {
-        pBookStrm->SetBufferSize( 0x8000 );     // still needed?
-
         XclImpRootData aImpData( eBiff, rMedium, xRootStrg, *pDocument, RTL_TEXTENCODING_MS_1252 );
         std::unique_ptr< ImportExcel > xFilter;
         switch( eBiff )
@@ -169,9 +167,8 @@ static ErrCode lcl_ExportExcelBiff( SfxMedium& rMedium, ScDocument *pDocument,
 
     // open the "Book"/"Workbook" stream
     tools::SvRef<SotStorageStream> xStrgStrm = ScfTools::OpenStorageStreamWrite( xRootStrg, aStrmName );
-    if( !xStrgStrm.is() || xStrgStrm->GetError() ) return SCERR_IMPORT_OPEN;
-
-    xStrgStrm->SetBufferSize( 0x8000 );     // still needed?
+    if (!xStrgStrm.is() || xStrgStrm->GetError())
+        return SCERR_IMPORT_OPEN;
 
     ErrCode eRet = SCERR_IMPORT_UNKNOWN_BIFF;
     XclExpRootData aExpData( bBiff8 ? EXC_BIFF8 : EXC_BIFF5, rMedium, xRootStrg, *pDocument, eNach );