Infinite loop in singlesocket

[ericwuseattle]

(gdb) p *entry
$29 = {
list = {
head = 0x80be848,
tail = 0x80be848,
dtor = 0x0,
size = 1
},
action = 1,
socketp = 0x0,
users = 1,
readers = 1,
writers = 0
}

1. the loop i = 0 to MAX_SOCKSPEREASYHANDLE
   https://github.com/curl/curl/blob/master/lib/multi.c#L2234

2. i was setting back to 0
   https://github.com/curl/curl/blob/master/lib/multi.c#L2255

3. when entry action == comboaction will go back 1) and i = 1, 2) will set to 0 again. loop forever.
   // comboaction = 1, entry->action = 1
   https://github.com/curl/curl/blob/master/lib/multi.c#L2306

could we make a change to use index rather re-using i?
For example:
/* check if new for this transfer */
int index = 0;
for(index; index < data->numsocks; index++) {

[bagder]

Thanks, I agree with your conclusion and I've proposed PR #3973 to fix this!