C90 compliance for #13104 fixes

src/test/test_util.c

@@ -3277,6 +3277,7 @@ test_util_di_ops(void)
   /* exhaustively white-box test tor_memeq
    * against each possible (single-byte) bit difference
    * some arithmetic bugs only appear with certain bit patterns */
+  {
   const uint8_t z = 0;
   uint8_t ii = 0;
   for (i = 0; i < 256; i++) {
@@ -3292,6 +3293,7 @@ test_util_di_ops(void)
     test_eq(tor_memcmp(&z, &ii, 1) > 0 ? GT : EQ, z > ii ? GT : EQ);
     test_eq(tor_memcmp(&ii, &z, 1) < 0 ? LT : EQ, ii < z ? LT : EQ);
   }
+  }
 
   tt_int_op(1, ==, safe_mem_is_zero("", 0));
   tt_int_op(1, ==, safe_mem_is_zero("", 1));