rpc: Use IsValidNumArgs in getblock

src/rpc/blockchain.cpp

@@ -824,9 +824,7 @@ static CBlock GetBlockChecked(const CBlockIndex* pblockindex)
 
 static UniValue getblock(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
+    const RPCHelpMan help{"getblock",
-        throw std::runtime_error(
-            RPCHelpMan{"getblock",
                 "\nIf verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'.\n"
                 "If verbosity is 1, returns an Object with information about block <hash>.\n"
                 "If verbosity is 2, returns an Object with information about block <hash> and information about each transaction. \n",
@@ -878,7 +876,11 @@ static UniValue getblock(const JSONRPCRequest& request)
                     HelpExampleCli("getblock", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
             + HelpExampleRpc("getblock", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
                 },
-            }.ToString());
+    };
+
+    if (request.fHelp || !help.IsValidNumArgs(request.params.size())) {
+        throw std::runtime_error(help.ToString());
+    }
 
     LOCK(cs_main);