Fix locking in arena_dirty_count().
This was a latent bug, since the function is (intentionally) not used.
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@ -639,12 +639,14 @@ arena_dirty_count(tsdn_t *tsdn, arena_t *arena)
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extent_t *extent;
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size_t ndirty = 0;
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malloc_mutex_assert_owner(tsdn, &arena->extents_mtx);
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malloc_mutex_lock(tsdn, &arena->extents_mtx);
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for (extent = qr_next(&arena->extents_dirty, qr_link); extent !=
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&arena->extents_dirty; extent = qr_next(extent, qr_link))
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ndirty += extent_size_get(extent) >> LG_PAGE;
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malloc_mutex_unlock(tsdn, &arena->extents_mtx);
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return (ndirty);
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}
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