Fix active expire division by zero.
Likely fix #6723. This is what happens AFAIK: we enter the main loop where we expire stuff until a given percentage of keys is still found to be logically expired. There are however other potential exit conditions. However the "sampled" variable is not always incremented inside the loop, because we may found no valid slot as we scan the hash table, but just NULLs ad dict entries. So when the do/while loop condition is triggered at the end, we do (expired*100/sampled), dividing by zero if we sampled 0 keys.
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