Merge #12559: Avoid locking cs_main in some wallet RPC

00f58f8 rpc: Avoid locking cs_main in some wallet RPC (João Barbosa)

Pull request description:

  Avoid locking `cs_main` in the folllowing wallet RPC:
   - `decoderawtransaction`
   - `getnewaddress`
   - `getrawchangeaddress`
   - `setlabel`

Tree-SHA512: 54089766b2a969a17479af6c60e8ce151fac1f8cec268d43c61e679d5d17e76d17e414240c9ca2bfd280165f3a04e24a51310eb283591cd601a7eebc8b2423ea

Author: laanwj

src/rpc/rawtransaction.cpp

@@ -562,7 +562,6 @@ static UniValue decoderawtransaction(const JSONRPCRequest& request)
             + HelpExampleRpc("decoderawtransaction", "\"hexstring\"")
         );
 
-    LOCK(cs_main);
     RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL});
 
     CMutableTransaction mtx;

src/wallet/rpcwallet.cpp

@@ -165,7 +165,7 @@ static UniValue getnewaddress(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_WALLET_ERROR, "Error: Private keys are disabled for this wallet");
     }
 
-    LOCK2(cs_main, pwallet->cs_wallet);
+    LOCK(pwallet->cs_wallet);
 
     // Parse the label first so we don't generate a key if there's an error
     std::string label;
@@ -276,7 +276,7 @@ static UniValue getrawchangeaddress(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_WALLET_ERROR, "Error: Private keys are disabled for this wallet");
     }
 
-    LOCK2(cs_main, pwallet->cs_wallet);
+    LOCK(pwallet->cs_wallet);
 
     if (!pwallet->IsLocked()) {
         pwallet->TopUpKeyPool();
@@ -331,7 +331,7 @@ static UniValue setlabel(const JSONRPCRequest& request)
             + HelpExampleRpc("setlabel", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", \"tabby\"")
         );
 
-    LOCK2(cs_main, pwallet->cs_wallet);
+    LOCK(pwallet->cs_wallet);
 
     CTxDestination dest = DecodeDestination(request.params[0].get_str());
     if (!IsValidDestination(dest)) {