scanner: Fix oddities in copyright printing

Some copyright strings could result in broken generated header files with
unmatched */

This change:
Runs the loop long enough so the copyright[i] == 0 test can actually
happen. (if there was no \n no copyright text was printed, */ still was)

Prints the opening /* even if there was whitespace at the start of
the very first line.

Only emits a */ if a /* was printed.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>