start_service() runs chgrp and chmod on /dev/dvb/*. Without a DVB
adapter the pattern does not match, so every start, including the one
during a package upgrade, prints
chgrp: /dev/dvb/*: No such file or directory
chmod: /dev/dvb/*: No such file or directory
Only touch the entries that exist. The fix itself is still needed for
adapters that were plugged in before the package was installed, as no
hotplug event sets their group then.
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>