[PATCH] Exit with failure if dc_open method fails

[Claudiu Olteanu]

If the dc_serial_*_open method fails then we should exit with
an error and don't try to open the device using the native
implementation.

Currently if the local Bluetooth adapter doesn't connect successfully
to a dive computer it tries to open the device using the native serial
implementation (libdivecomputer.c: 944 - serial == NULL).

I am not sure how it should work for the serial FTDI implementation if
it fails. Should it try to open the device again using the old native
serial
implementation? Anton?

Cheers,
Claudiu
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