Merge bitcoin/bitcoin#24403: Avoid implicit-integer-sign-change in VerifyLoadedChainstate

fa7991601c Fixup style of VerifyDB (MarcoFalke)
fa462ea787 Avoid implicit-integer-sign-change in VerifyLoadedChainstate (MarcoFalke)

Pull request description:

  This happens when checking all blocks (`-1`).

  To test:

  ```
  ./configure CC=clang CXX=clang++ --with-sanitizers=undefined,integer
  make
  UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" ./test/functional/rpc_blockchain.py

ACKs for top commit:
  theStack:
    Code-review ACK fa7991601c
  brunoerg:
    crACK fa7991601c

Tree-SHA512: bcbe6becf2fbedd21bbde83a544122e79465937346802039532143b2e4165784905a8852c0ccb088b964874df5e5550931fdde3629cbcee3ae237f2f63c43a8e

test/functional/rpc_blockchain.py

@@ -69,7 +69,14 @@ class BlockchainTest(BitcoinTestFramework):
         self.wallet = MiniWallet(self.nodes[0])
         self.mine_chain()
         self._test_max_future_block_time()
-        self.restart_node(0, extra_args=['-stopatheight=207', '-prune=1'])  # Set extra args with pruning after rescan is complete
+        self.restart_node(
+            0,
+            extra_args=[
+                "-stopatheight=207",
+                "-checkblocks=-1",  # Check all blocks
+                "-prune=1",  # Set pruning after rescan is complete
+            ],
+        )
 
         self._test_getblockchaininfo()
         self._test_getchaintxstats()