test_xml_output: do not use -n with echo
test_xml_output: do not use -n with echo

On some systems (e.g. OSX) a script will use the built-in version
of echo, which does not support arguments. Instead of getting no
newline, instead there is an extra "-n" in the output.

Without the -n, everything works as expected.

git-svn-id: caee63afe878fe2ec7dbba394a86c9654d9110ca@982 64e312b2-a51f-0410-8e61-82d0ca0eb02a

dashaomai/check-code,svn2github/check,svn2github/check,dashaomai/check-code,svn2github/check,svn2github/check,dashaomai/check-code,svn2github/check,dashaomai/check-code