validation: Make BlockManager::LookupBlockIndex const

Author: dongcarl

src/validation.cpp

@@ -169,7 +169,7 @@ namespace {
     std::set<int> setDirtyFileInfo;
 } // anon namespace
 
-CBlockIndex* BlockManager::LookupBlockIndex(const uint256& hash)
+CBlockIndex* BlockManager::LookupBlockIndex(const uint256& hash) const
 {
     AssertLockHeld(cs_main);
     assert(std::addressof(g_chainman.BlockIndex()) == std::addressof(m_block_index));

src/validation.h

@@ -457,7 +457,7 @@ class BlockManager
         const CChainParams& chainparams,
         CBlockIndex** ppindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
-    CBlockIndex* LookupBlockIndex(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
+    CBlockIndex* LookupBlockIndex(const uint256& hash) const EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     /** Find the last common block between the parameter chain and a locator. */
     CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator) EXCLUSIVE_LOCKS_REQUIRED(cs_main);