Fix off-by-one error when getting the last line of the block in XmlExporter

Author: cgkantidis

src/XmlExporter.cpp

@@ -39,14 +39,14 @@ void XmlExporter::ReportSeq(
         << "    <set LineCount=\"" << count << "\">"
         << std::endl;
     int startLineNumber1 = source1.GetLine(line1).GetLineNumber();
-    int endLineNumber1 = source1.GetLine(line1 + count).GetLineNumber();
+    int endLineNumber1 = source1.GetLine(line1 + count - 1).GetLineNumber();
     Out()
         << "        <block SourceFile=\"" << source1.GetFilename()
         << "\" StartLineNumber=\"" << startLineNumber1
         << "\" EndLineNumber=\"" << endLineNumber1 << "\"/>"
         << std::endl;
     int startLineNumber2 = source2.GetLine(line2).GetLineNumber();
-    int endLineNumber2 = source2.GetLine(line2 + count).GetLineNumber();
+    int endLineNumber2 = source2.GetLine(line2 + count - 1).GetLineNumber();
     Out()
         << "        <block SourceFile=\"" << source2.GetFilename()
         << "\" StartLineNumber=\"" << startLineNumber2

tests/Simple/expected-xml.log

@@ -1,8 +1,8 @@
 <?xml version="1.0"?>
 <duplo>
     <set LineCount="5">
-        <block SourceFile="tests/Simple/LineNumbers.c" StartLineNumber="7" EndLineNumber="13"/>
-        <block SourceFile="tests/Simple/LineNumbers.c" StartLineNumber="1" EndLineNumber="7"/>
+        <block SourceFile="tests/Simple/LineNumbers.c" StartLineNumber="7" EndLineNumber="12"/>
+        <block SourceFile="tests/Simple/LineNumbers.c" StartLineNumber="1" EndLineNumber="5"/>
         <lines xml:space="preserve">
             <line Text="AAAAA"/>
             <line Text="BBBBB"/>