Fix mem leak - dedup - deduplicating backup program
 (HTM) git clone git://bitreich.org/dedup/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/dedup/
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       ---
 (DIR) commit 13ea526261fd0d7821dbf271bd9ccd509ae4e6fd
 (DIR) parent 2646d0e4e3cbc7b6fe481958d112d7ba1d654911
 (HTM) Author: sin <sin@2f30.org>
       Date:   Tue,  5 Mar 2019 13:52:27 +0000
       
       Fix mem leak
       
       If the node already exists in the rb-tree a pointer to it is returned.
       In that case we can free the temporary node that was allocated because
       it will not be used.
       
       Diffstat:
         M cache.c                             |       3 ++-
       
       1 file changed, 2 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/cache.c b/cache.c
       @@ -83,7 +83,8 @@ add_cache_entry(struct cache *cache, struct cache_entry *ent)
                struct cache_node *node;
        
                node = alloc_cache_node(ent);
       -        RB_INSERT(cache_head, &cache->nodes, node);
       +        if (RB_INSERT(cache_head, &cache->nodes, node) != NULL)
       +                free_cache_node(node);
        }
        
        int