USHRT_MAX -> SAL_MAX_UINT16

The checks against USHRT_MAX were like that already in
84a3db80 "initial import", while the casts to
sal_uInt16 were later introduced with a7762676
"#83294# SwXTextTable/Cell::get/setData with a sequence of rows instead of a
sequence of columns".

Change-Id: Iab6f658f91edcec9e8e6fe6fbf0da730b3ad4581
Reviewed-on: https://gerrit.libreoffice.org/48468Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sw/source/core/unocore/unotbl.cxx

@@ -2038,7 +2038,7 @@ SwFrameFormat* SwXTextTable::GetFrameFormat()
 
 void SwXTextTable::initialize(sal_Int32 nR, sal_Int32 nC)
 {
-    if (!m_pImpl->IsDescriptor() || nR <= 0 || nC <= 0 || nR >= USHRT_MAX || nC >= USHRT_MAX)
+    if (!m_pImpl->IsDescriptor() || nR <= 0 || nC <= 0 || nR >= SAL_MAX_UINT16 || nC >= SAL_MAX_UINT16)
         throw uno::RuntimeException();
     m_pImpl->m_nRows = static_cast<sal_uInt16>(nR);
     m_pImpl->m_nColumns = static_cast<sal_uInt16>(nC);