FIXED redis-benchmark's idle mode.With idle mode shouldn't create write event

when i use redis-benchmark's idlemode, 
 redis-benchmark -p 6379 -h ip -I -c 5000

the result is 

> Creating 5000 idle connections and waiting forever (Ctrl+C when done)
> All clients disconnected... aborting.

I think the result isn't correct.
look into the detail code.I think  In idle mode,the connection shouldn't create write event