SideChain: reduce lock scope in get_outputs_blob

src/side_chain.cpp

@@ -696,6 +696,9 @@ bool SideChain::get_outputs_blob(PoolBlock* block, uint64_t total_reward, std::v
 {
 	blob.clear();
 
+	std::vector<MinerShare> tmpShares;
+	std::vector<uint64_t> tmpRewards;
+	{
 		ReadLock lock(m_sidechainLock);
 
 		auto it = m_blocksById.find(block->m_sidechainId);
@@ -722,12 +725,10 @@ bool SideChain::get_outputs_blob(PoolBlock* block, uint64_t total_reward, std::v
 			return true;
 		}
 
-	std::vector<MinerShare> tmpShares;
-	std::vector<uint64_t> tmpRewards;
-
 		if (!get_shares(block, tmpShares) || !split_reward(total_reward, tmpShares, tmpRewards) || (tmpRewards.size() != tmpShares.size())) {
 			return false;
 		}
+	}
 
 	const size_t n = tmpShares.size();