This reverts commit b5e3f8a5.

The problem is this:

==24217== Conditional jump or move depends on uninitialised value(s)
==24217==    at 0x29A25FCE: SfxObjectShell::SetError(unsigned int, rtl::OUString const&) (objmisc.cxx:220)
==24217==    by 0x29A35E6E: SfxObjectShell::ImportFrom(SfxMedium&, com::sun::star::uno::Reference<com::sun::star::text::XTextRange> const&) (objstor.cxx:2300)
==24217==    by 0x29A3705C: SfxObjectShell::DoLoad(SfxMedium*) (objstor.cxx:765)
==24217==    by 0x29A6BC48:
SfxBaseModel::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) (sfxbasemodel.cxx:1802)

The commit is bogus because it introduces a
DynamicErrorInfo::GetErrorCode(), which overloads
ErrorInfo::GetErrorCode(), which is used at least in
DynamicErrorInfo_Impl::RegisterEDcr() and used to return a constructor
argument of DynamicErrorInfo but now returns pImpl->lErrId,
which is what this statement is trying to initialize.

Ultimately this causes my clang+ASAN build to fail because the
uninitialized error code happens to be detected as a mere Warning:

Test name: testMathMalformedXml::Import
assertion failed
- Expression: !xComponent.is()
- loading succeeded: sw/qa/extras/ooxmlimport/data/math-malformed_xml.docx

Change-Id: I9141144e0bc356ee54279948f2fce036d1831a86