Current validation check function inside resulttool disallow the
report for single result file although the underlying library
was able to handle both directory and file as source input to report.
Removed the validation check as it was no longer needed and to
enable report for single result file.
Signed-off-by: Yeoh Ee Peng <ee.peng.yeoh@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Armin Kuster <akuster808@gmail.com>
