Segfault in detail module

[Alan DeKok]

Stelian Ionescu wrote:
> Its configuration is
> 
> 	detailfile = ${radacctdir}/detail/%{Client-IP-Address}-%Y%m%d.active
> 	detailperm = 0600
> 	header = "%t"

  I've pushed a fix.

  Alan DeKok.