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gefs: fix ref leak when setb clears a block

--- a/sys/src/cmd/gefs/tree.c

+++ b/sys/src/cmd/gefs/tree.c

@@ -444,10 +444,13 @@

 static void

 setb(Blk **dst, Tree *t, Blk *b)

 {

-	if(*dst != nil)

+	if(*dst != nil){

 		freeblk(t, *dst);

+		dropblk(*dst);

+	}

 	if(b->nval == 0){

 		freeblk(t, b);

+		dropblk(b);

 		*dst = nil;

 	}else{

 		enqueue(b);

-- 

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