ofz#3362 SYLK import: check ;X;Y;C;R col/row validity early

Change-Id: I37d5ce67f975b6b89c4b8a9baefae2467da2eb84
diff --git a/sc/source/ui/docshell/impex.cxx b/sc/source/ui/docshell/impex.cxx
index 0a68d36..cd92f13 100644
--- a/sc/source/ui/docshell/impex.cxx
+++ b/sc/source/ui/docshell/impex.cxx
@@ -1753,15 +1753,35 @@ bool ScImportExport::Sylk2Doc( SvStream& rStrm )
                    {
                        case 'X':
                            nCol = static_cast<SCCOL>(OUString(p).toInt32()) + nStartCol - 1;
                            if (nCol < 0 || MAXCOL < nCol)
                            {
                                SAL_WARN("sc.ui","ScImportExport::Sylk2Doc - ;X invalid nCol=" << nCol);
                                nCol = std::max<SCCOL>( 0, std::min<SCCOL>( nCol, MAXCOL));
                            }
                            break;
                        case 'Y':
                            nRow = OUString(p).toInt32() + nStartRow - 1;
                            if (nRow < 0 || MAXROW < nRow)
                            {
                                SAL_WARN("sc.ui","ScImportExport::Sylk2Doc - ;Y invalid nRow=" << nRow);
                                nRow = std::max<SCROW>( 0, std::min<SCROW>( nRow, MAXROW));
                            }
                            break;
                        case 'C':
                            nRefCol = static_cast<SCCOL>(OUString(p).toInt32()) + nStartCol - 1;
                            if (nRefCol < 0 || MAXCOL < nRefCol)
                            {
                                SAL_WARN("sc.ui","ScImportExport::Sylk2Doc - ;C invalid nRefCol=" << nRefCol);
                                nRefCol = std::max<SCCOL>( 0, std::min<SCCOL>( nRefCol, MAXCOL));
                            }
                            break;
                        case 'R':
                            nRefRow = OUString(p).toInt32() + nStartRow - 1;
                            if (nRefRow < 0 || MAXROW < nRefRow)
                            {
                                SAL_WARN("sc.ui","ScImportExport::Sylk2Doc - ;R invalid nRefRow=" << nRefRow);
                                nRefRow = std::max<SCROW>( 0, std::min<SCROW>( nRefRow, MAXROW));
                            }
                            break;
                        case 'K':
                        {