dtc: Use noinput flex option for convert-dtsv0 to remove warning

The convert-dtsv0 lexer doesn't use lex's input() macro/function.
This can result in "defined but not used" warnings.  This patch uses
flex's noinput option to prevent this warning (as we already do for
dtc-lexer.l).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed