janitorial: asc2log: properly close infile
janitorial: asc2log: properly close infile

outfile is closed as well, so do this symmetrically for infile.

Signed-off-by: Robert Schwebel <970fc508fe817812d8cb9779a02e95fd9752eeb1@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <4a0ea1158d3cc63151119c05b1bff00c0bdbf421@pengutronix.de>

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