Can't reuse sync logger when panic and recovered

[sunjayaali]

When using sync logger and the given logger panic, that sync logger can't be reuse again because of forever locked mutex.

Can we just defer the Unlock()?

[peterbourgon]

Log should never panic, and if it does, you shouldn't recover from it.

But, I have no objection to changing this code to defer the unlock. @ChrisHines?

[ChrisHines]

Yes, using a defer is fine.