net: ping: return an error exit code when connection fails
ping command does not always returns 1 as exit code when connection to
host fails. In particular it returns the exit code of the previous run.
This patch fixes this issue.
Signed-off-by: Mirko Damiani <mirko@develer.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>