USHRT_MAX -> SAL_MAX_UINT16 for XMLCharContext::m_nCount

...which is of type sal_uInt16 ever since the class got introduced with
0e3ff5db "INTEGRATION: CWS oj14: #i77059# export
char content helper for example line break"

Change-Id: I1dcb2894861ea5b6104932d896b7166c5c0b4689
Reviewed-on: https://gerrit.libreoffice.org/48347Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

xmloff/source/text/txtparai.cxx

@@ -119,8 +119,8 @@ XMLCharContext::XMLCharContext(
                 sal_Int32 nTmp = xAttrList->getValueByIndex(i).toInt32();
                 if( nTmp > 0 )
                 {
-                    if( nTmp > USHRT_MAX )
-                        m_nCount = USHRT_MAX;
+                    if( nTmp > SAL_MAX_UINT16 )
+                        m_nCount = SAL_MAX_UINT16;
                     else
                         m_nCount = static_cast<sal_uInt16>(nTmp);
                 }