cgen: fix for passing functions as voidptr args

vlib/builtin/string_test.v

@@ -834,3 +834,37 @@ fn test_string_alias() {
 	ss := s + '!'
 }
 */
+
+// sort an array of structs, by their string field values
+
+struct Ka {
+	s string
+	i int
+}
+
+fn test_sorter() {
+	mut arr := [
+		Ka{
+			s: 'bbb'
+			i: 100
+		},
+		Ka{
+			s: 'aaa'
+			i: 101
+		},
+		Ka{
+			s: 'ccc'
+			i: 102
+		}
+	]
+	cmp := fn (a, b &Ka) int {
+		return compare_strings(a.s, b.s)
+	}
+	arr.sort_with_compare(cmp)
+	assert arr[0].s == 'aaa'
+	assert arr[0].i == 101
+	assert arr[1].s == 'bbb'
+	assert arr[1].i == 100
+	assert arr[2].s == 'ccc'
+	assert arr[2].i == 102
+}

vlib/v/gen/fn.v

@@ -644,7 +644,10 @@ fn (mut g Gen) ref_or_deref_arg(arg ast.CallArg, expected_type table.Type) {
 			}
 		}
 		if !g.is_json_fn {
-			g.write('(voidptr)&/*qq*/')
+			arg_typ_sym := g.table.get_type_symbol(arg.typ)            
+			if arg_typ_sym.kind != .function {
+				g.write('(voidptr)&/*qq*/')
+			}
 		}
 	}
 	g.expr_with_cast(arg.expr, arg.typ, expected_type)