fix deadlock

chain/messagepool/pruning.go

@@ -59,11 +59,9 @@ func (mp *MessagePool) pruneMessages(ctx context.Context, ts *types.TipSet) erro
 	}
 
 	// we also never prune locally published messages
-	mp.lk.Lock()
 	for actor := range mp.localAddrs {
 		protected[actor] = struct{}{}
 	}
-	mp.lk.Unlock()
 
 	// Collect all messages to track which ones to remove and create chains for block inclusion
 	pruneMsgs := make(map[cid.Cid]*types.SignedMessage, mp.currentSize)