Fixed small memory leak into ipt_geoip.c

[Samuel Jean]

Hi there,

The subject said it all, I was allocating memory for a 
checkentry()/destroy() refcount
but not freeing it..

Current code can be retreived from :
svn co http://svn.cookinglinux.org/netfilter/geoip/trunk

Bug discovered with nfsim, the netfilter developer's favorite toy.

See ya,

--peejix