[sr-dev] [kamailio/kamailio] pv: log uninit $var() (PR #3114)

[Daniel-Constantin Mierla]

@smititelu - that note from the docs sounds ok for me (maybe because I wrote it, although I am not sure I did). Practically wants to say that assign explicitly a value before using it, not to get the value set a while ago in another SIP message processing context.

If you do:

```
request_route {
...
  while ($var(i) < 100) {
    ...
    $var(i) = $var(i) + 1;
  }
...
}
```

The while loop gets inside once because  $var(i) is 0 first time, but then remains set to 100 for all next requests. Therefore set it to the value you want before using it:

```
request_route {
...
  $var(i) = 0;
  while ($var(i) < 100) {
    ...
    $var(i) = $var(i) + 1;
  }
...
}
```

Feel free to change the statement in the docs, if you consider more clarifications there, but I don't see any benefit in storing an extra int field in the internal var structure.

Maybe $vn() offers better the kind of variable you need. It is like $var() but can have $null value (state).

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