Small bug in rlm_sql_log

[Guy Fraser]

I discovered that if you use a file name like :

path = ${radacctdir}/%Y/%m/sqlrelay-%Y%m%d

You get an error if the path does not exist.

A simple remedy is to configure auth_log to put
files in the same directory, because it will create 
the directories.

I will look into adding the functionality into this
module to allow creation of the required directories
but may not have time right away.

TTFN