Fix uninitialized URI in batch RPC requests

This fixes "Wallet file not specified" errors when making batch wallet RPC
calls with more than one wallet loaded. This issue was reported by
NicolasDorier <nicolas.dorier@gmail.com>
https://github.com/bitcoin/bitcoin/issues/11257

Request URI is not used for anything except multiwallet request dispatching, so
this change has no other effects.

Fixes #11257

src/httprpc.cpp

@@ -192,7 +192,7 @@ static bool HTTPReq_JSONRPC(HTTPRequest* req, const std::string &)
 
         // array of requests
         } else if (valRequest.isArray())
-            strReply = JSONRPCExecBatch(valRequest.get_array());
+            strReply = JSONRPCExecBatch(jreq, valRequest.get_array());
         else
             throw JSONRPCError(RPC_PARSE_ERROR, "Top-level object parse error");
 

src/rpc/server.cpp

@@ -389,11 +389,10 @@ bool IsDeprecatedRPCEnabled(const std::string& method)
     return find(enabled_methods.begin(), enabled_methods.end(), method) != enabled_methods.end();
 }
 
-static UniValue JSONRPCExecOne(const UniValue& req)
+static UniValue JSONRPCExecOne(JSONRPCRequest jreq, const UniValue& req)
 {
     UniValue rpc_result(UniValue::VOBJ);
 
-    JSONRPCRequest jreq;
     try {
         jreq.parse(req);
 
@@ -413,11 +412,11 @@ static UniValue JSONRPCExecOne(const UniValue& req)
     return rpc_result;
 }
 
-std::string JSONRPCExecBatch(const UniValue& vReq)
+std::string JSONRPCExecBatch(const JSONRPCRequest& jreq, const UniValue& vReq)
 {
     UniValue ret(UniValue::VARR);
     for (unsigned int reqIdx = 0; reqIdx < vReq.size(); reqIdx++)
-        ret.push_back(JSONRPCExecOne(vReq[reqIdx]));
+        ret.push_back(JSONRPCExecOne(jreq, vReq[reqIdx]));
 
     return ret.write() + "\n";
 }

src/rpc/server.h

@@ -191,7 +191,7 @@ extern std::string HelpExampleRpc(const std::string& methodname, const std::stri
 bool StartRPC();
 void InterruptRPC();
 void StopRPC();
-std::string JSONRPCExecBatch(const UniValue& vReq);
+std::string JSONRPCExecBatch(const JSONRPCRequest& jreq, const UniValue& vReq);
 
 // Retrieves any serialization flags requested in command line argument
 int RPCSerializationFlags();