tdf#75280: Convert inappropriate use of sal_uIntPtr to better integer types

Change-Id: I5c25999a17ed64cc5a2fa586cd7d986d233a67f2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87455
Tested-by: Jenkins
Reviewed-by: Muhammet Kara <muhammet.kara@collabora.com>
diff --git a/svx/source/gallery2/codec.cxx b/svx/source/gallery2/codec.cxx
index 773b769..5063632 100644
--- a/svx/source/gallery2/codec.cxx
+++ b/svx/source/gallery2/codec.cxx
@@ -35,7 +35,7 @@

bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
{
    const sal_uIntPtr   nPos = rStm.Tell();
    const sal_uInt64   nPos = rStm.Tell();
    bool        bRet;
    sal_uInt8       cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;