Andrey Konovalov dd1609f876 executor: proceed even if /dev/net/tun is not available
For some racy bugs syzkaller can generate a C reproducer with tun
enabled, when it's not actuallly required to trigger the bug.
Some kernel developers (that don't have CONFIG_TUN=y on their setups)
complain about such C repros.
When tun is not available, instead of exiting, print a message that tun
initialization failed and proceed.
2017-11-08 17:43:40 +01:00
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