fix defer in a for loop function.

[yanggangtony]

Signed-off-by: yanggang gang.yang@daocloud.io

Do not use defer in a loop unless you’re sure about what you’re doing. It may not work as expected.

#2 — Defer inside a loop

[bobrik]

Unless you have some specific issue, it does work as expected here.

[yanggangtony]

Unless you have some specific issue, it does work as expected here.

Nop..
I just saw it on golang-practise ..
Please feel good to close it..