Remove obsolete arena_maybe_purge() call.
Remove obsolete arena_maybe_purge() call.

Remove a call to arena_maybe_purge() that was necessary for ratio-based
purging, but is obsolete in the context of decay-based purging.

wqfish/jemalloc,wqfish/jemalloc,wqfish/jemalloc,wqfish/jemalloc,wqfish/jemalloc