Free the object while realloc failed

Inspected by cppcheck

Signed-off-by: Gary Ching-Pang Lin <glin@suse.com>
Add the bounds checking for the mok list

Signed-off-by: Gary Ching-Pang Lin <glin@suse.com>
Update the manpage for --import-hash and delete-hash

Signed-off-by: Gary Ching-Pang Lin <glin@suse.com>
Update TODO