message: Add missing LOCK(cs_utxo) when clearing coins cache.
diff: @@ -272,7 +272,12 @@ public:
  /**
  * Empty the coins cache. Used primarily when we're shutting down and want to release memory
  */
  - void Clear() { cacheCoins.clear(); }
  + void Clear()
  + {
  + LOCK(cs_utxo);
  + cacheCoins.clear();
  + }
  +
  /**
  * Remove excess entries from this cache.
  * Entries are trimmed starting from the beginning of the map. In this way if those entries
  