cinterion: bail earlier if the plugin doesn't support the port

Caused a crash with the Sierra plugin due to an assertion failure;
the Cinterion plugin shouldn't claim to possibly support ports
it knows it won't support.  In this case, it claimed to support
Sierra modems, so it would try to run probing after Sierra had
done so.  Ideally this should work, but for now just make sure
the Cinterion plugin doesn't claim to support these ports when
it knows it doesn't.

0 files changed, 0 insertions, 0 deletions