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snap: fix small disk space leak

the snap deadlist is special, and blocks should be added
to it regardless of the generation number.

--- a/snap.c

+++ b/snap.c

@@ -548,12 +548,12 @@

 	 * are the responsibility of the other chain; in this chain, we

 	 * leak it and let the last reference in the other chain clean up

 	 */

-	if(bp.gen <= t->base)

-		return;

 	if(t == &fs->snap)

 		dl = &fs->snapdl;

-	else

+	else if(bp.gen > t->base)

 		dl = getdl(t->gen, bp.gen);

+	else

+		return;

 	if(waserror()){

 		putdl(dl);

 		nexterror();