Allow I2C bus probing to be interrupted early by sending CTRL-C. This is
usefull when calling the tool without any arguments and one of the busses
is misconfigured (waiting for 100+ failures is pretty inconvenient).
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>