SessionStarter: fix leak

fix leak of session starter object if the modem disappears while connecting

BUG=chromium-os:1916
TEST=none

Change-Id: Ibbb7206583fd3252f7c181eb6e708e9d2afa9a26
Reviewed-on: https://gerrit-int.chromium.org/4284
Reviewed-by: Jason Glasgow <jglasgow@google.com>
Tested-by: Jason Glasgow <jglasgow@google.com>
1 file changed