USDT: take into account the result of Probe::enable() #2006
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Hi,
Currently Context::enable_probe() discards the result of Probe::enable() even if it fails. This is something that I've already mentioned in #1998 (it didn't show any warning when tried to read semaphore value from unreadable memory location). Today I hit another case when I tried to setup USDT context by passing only path to binary without specifying PID. Here is a tiny patch that fixes this.