fixup! [libevmasm] Add support to import evm assembly json.

Author: cameel

libevmasm/Assembly.cpp

@@ -508,7 +508,7 @@ Json::Value Assembly::assemblyJSON(std::map<std::string, unsigned> const& _sourc
 	return root;
 }
 
-std::pair<std::shared_ptr<Assembly>, std::vector<std::string>> Assembly::fromJSON(Json::Value const& _json, std::vector<std::string> const& _sourceList, int _level)
+std::pair<std::shared_ptr<Assembly>, std::vector<std::string>> Assembly::fromJSON(Json::Value const& _json, std::vector<std::string> const& _sourceList, size_t _level)
 {
 	solRequire(_json.isObject(), AssemblyImportException, "Supplied JSON is not an object.");
 	static std::set<std::string> const validMembers{".code", ".data", ".auxdata", "sourceList"};

libevmasm/Assembly.h

@@ -165,7 +165,7 @@ class Assembly
 	static std::pair<std::shared_ptr<Assembly>, std::vector<std::string>> fromJSON(
 		Json::Value const& _json,
 		std::vector<std::string> const& _sourceList = {},
-		int _level = 0
+		size_t _level = 0
 	);
 
 	/// Mark this assembly as invalid. Calling ``assemble`` on it will throw.