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blk: log free messages before making the block allocatable

this prevents the freed block from becoming part of the free
list before it's recorded as free

--- a/blk.c

+++ b/blk.c

@@ -586,9 +586,9 @@

 	r = -1;

 	a = getarena(b);

-	if(freerange(a->free, b, Blksz) == -1)

-		goto out;

 	if(logop(a, b, Blksz, LogFree) == -1)

+		goto out;

+	if(freerange(a->free, b, Blksz) == -1)

 		goto out;

 	a->used -= Blksz;

 	r = 0;