Fix return infer

Author: CppCXY

EmmyLua/CodeAnalysis/Compilation/Analyzer/ResolveAnalyzer/ResolveAnalyzer.cs

@@ -159,11 +159,6 @@ private void ResolveReturn(UnResolved unResolved, AnalyzeContext analyzeContext)
             var idType = Context.Compilation.Db.QueryTypeFromId(id);
             if (idType is LuaMethodType methodType)
             {
-                if (!methodType.MainSignature.ReturnType.Equals(Builtin.Unknown))
-                {
-                    return;
-                }
-
                 var block = unResolvedMethod.Block;
                 var returnType = AnalyzeBlockReturns(block, out var _, analyzeContext);
                 methodType.MainSignature.ReturnType = returnType;

EmmyLua/CodeAnalysis/Compilation/Analyzer/ResolveAnalyzer/ResolveDependencyGraph.cs

@@ -206,7 +206,7 @@ private void CalcResolveReturn(UnResolved unResolved)
             var idType = context.Compilation.Db.QueryTypeFromId(id);
             if (idType is LuaMethodType methodType)
             {
-                if (!methodType.MainSignature.ReturnType.Equals(Builtin.Unknown))
+                if (!methodType.MainSignature.ReturnType.Equals(Builtin.Nil))
                 {
                     OnResolved?.Invoke(unResolved, ResolveState.UnResolveReturn);
                     return;