wallet: Add error handling. Check return value of ParseUInt32(...) in ParseHDKeypath(...).

src/wallet/rpcwallet.cpp

@@ -4433,7 +4433,9 @@ bool ParseHDKeypath(std::string keypath_str, std::vector<uint32_t>& keypath)
             return false;
         }
         uint32_t number;
-        ParseUInt32(item, &number);
+        if (!ParseUInt32(item, &number)) {
+            return false;
+        }
         path |= number;
 
         keypath.push_back(path);