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Exercise some of the allocation/put locking.

--- a/lib/std/alloc.myr

+++ b/lib/std/alloc.myr

@@ -253,7 +253,7 @@

 		bkt = &buckets[bktnum(sz)]

 		lock(memlck)

 		bktfree(bkt, p)

-		lock(memlck)

+		unlock(memlck)

 	else

 		freemem(p, sz)

 	;;

--- a/lib/thread/test/mutex.myr

+++ b/lib/thread/test/mutex.myr

@@ -18,15 +18,16 @@

 	while thread.xget(&done) != Nherd

 		/* nothing */

 	;;

-	if val != 10_000 * 20

+	if val != 1000 * 20

 		std.fatal("mutexes are broken, got {}\n", val)

 	;;

 }

 const incvar = {

-	for var i = 0; i < 10_000; i++

+	for var i = 0; i < 1000; i++

 		thread.mtxlock(&mtx)

 		val++

+		std.put("val: {}\n", val)

 		thread.mtxunlock(&mtx)

 	;;

 	thread.xadd(&done, 1)