bugfix! Missing error check in argument parsing routine

examples/func.noja

@@ -0,0 +1,9 @@
+
+fun add(a: int | float = 1, b = 8)
+    return a + b;
+
+c = add(3, 4);
+
+assert(c == 7);
+
+print(c);

src/lib/compiler/parse.c

@@ -2023,6 +2023,8 @@ static Node *parse_function_definition(Context *ctx)
 
 	int   argc = 0; // Initialization for the warning.
 	Node *argv = parse_function_arguments(ctx, &argc);
+	if(argv == NULL)
+		return NULL;
 	
 	if(done(ctx))
 	{