cmd/mbf: remove pointless recover

This used to scrub the cache, and was not fully removed when that became nonviable.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -59,14 +59,7 @@ func main() {
 	defer stop()
 
 	var cm cache
-	defer func() {
+	defer func() { cm.Close() }()
-		cm.Close()
-
-		if r := recover(); r != nil {
-			fmt.Println(r)
-			log.Fatal("consider scrubbing the on-disk cache")
-		}
-	}()
 
 	var (
 		flagQuiet bool