Thanks, it can be merged, but it needs also a note in the docs about the new return code.
More about the return code of the save() -- returning 0 seems to be a bug right now,
because there is a flag to control if the reply should be sent or not from the code --
REG_SAVE_NORPL_FL.
```
error:
update_stat(rejected_registrations, 1);
if (is_route_type(REQUEST_ROUTE) && !is_cflag_set(REG_SAVE_NORPL_FL) )
reg_send_reply(_m);
return 0;
```
It should be a negative value and let the config writer to write a log, etc. and do exit.
The default config file is expecting this in:
```
if (!save("location")) {
sl_reply_error();
}
exit;
```
Probably more different return codes can be used in order to differentiate between various
error cases.
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