Prevented Unnecessary panic in log_write#41
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In log_write, the function panics even in the case when 1 slot is remaining, because it thinks that the value of the log header is about to increase. But writes can coalesce, and that may not change log.lh.n. Hence we can prevent a premature panic.
https://piazza.com/class/lqkhcjr4xst5cz/post/80