Using tftp command does not work proper when files
have FILESIZE_MAX, as copy_file and show_progress
can not handle it. Check the file size for FILESIZE_MAX
and handle it as file size = 0.
Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>