cangen: allow double value for gap
cangen: allow double value for gap

This way a user can specify a gap below 1ms. This is somehwat similar
to setting the gap to 0, but the ENOBUFS are greatly reduced, so a given
amount of CAN messages by -n is still usefull and useable.

Signed-off-by: Alexander Stein <dbef83f64948dc68aad31596bbf6991154a9d730@systec-electronic.com>
Signed-off-by: Oliver Hartkopp <06a38fb2ed1a2d0a17f4f06761ac2e5ace5a31ab@hartkopp.net>

carloop/can-utils-osx,carloop/can-utils-osx