[sr-dev] [kamailio/kamailio] alias_db_lookup is returning `-1` if result is not found. Documentation implies it should return false. (#2517)

[Ben Kaufman]

Is my problem with the use of the negation operator?  Or should I be calling the function in the condition instead of assigning to a variable and then evaluating the variable?

```
$vn(alias_found) = alias_db_lookup("DbAliases");
if ( !$vn(alias_found) ) {
    ## I would expect this to execute if no alias is found.
   return;
}
## I would expect to reach here if the alias is found.
```

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