Merge #20386: Silence false positive GCC warning in wallet/rpcwallet.cpp

049feabf28 Add missing optional.h include (Kristaps Kaupe)
29c66ace5c Silence false positive GCC warning (Kristaps Kaupe)

Pull request description:

  Resolves #20381.

ACKs for top commit:
  jnewbery:
    utACK 049feabf28
  practicalswift:
    ACK 049feabf28: diagnostics signal to noise is increased by getting rid of false positives
  hebasto:
    ACK 049feabf28, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 05d84f51521c3b843ed6bf284a83a91db015ad0cd4fcf8b602275812575c1f6b4899286a89d360fbd3caef184abdfb9d834e119842d8740919892f05a0f9e1f8

src/wallet/rpcwallet.cpp

@@ -8,6 +8,7 @@
 #include <interfaces/chain.h>
 #include <key_io.h>
 #include <node/context.h>
+#include <optional.h>
 #include <outputtype.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
@@ -3593,7 +3594,7 @@ static RPCHelpMan rescanblockchain()
     }
 
     int start_height = 0;
-    Optional<int> stop_height;
+    Optional<int> stop_height = MakeOptional(false, int());
     uint256 start_block;
     {
         LOCK(pwallet->cs_wallet);