avoid jumping into statement expression

tcctest.c

@@ -1803,14 +1803,14 @@ void local_label_test(void)
 {
     int a;
     goto l1;
- l2:
-    a = 1 + ({
-        __label__ l1, l2, l3;
-        goto l4;
+ l2:
     a = 1 + ({
+        __label__ l1, l2, l3, l4;
+        goto l1;
+    l4:
         printf("aa1\n");
         goto l3;
-    l2:
+    l2:
         printf("aa3\n");
         goto l4;
     l1:
@@ -1819,12 +1819,12 @@ void local_label_test(void)
     l3:;
         1;
     });
-    printf("a=%d\n", a);
+    printf("a=%d\n", a);
     return;
  l4:
-    printf("bb1\n");
+    printf("bb1\n");
     goto l2;
- l4:
+ l1:
     printf("bb2\n");
     goto l4;
 }