crush: fix recursion through intervening types

This fixes pretty core behavior when doing recursion down the tree.  I
suspect it was broken when changing the retry behavior.

Signed-off-by: Sage Weil <sage@newdream.net>

src/crush/mapper.c

@@ -368,6 +368,7 @@ static int crush_choose(struct crush_map *map,
 					BUG_ON(item >= 0 ||
 					       (-1-item) >= map->max_buckets);
 					in = map->buckets[-1-item];
+					retry_bucket = 1;
 					continue;
 				}