addressbook: Fix ordering of parameters to fread()
addressbook: Fix ordering of parameters to fread()

This is a follow up to commit 2a5d6db6, since it did not eliminate the
use of tainted data in the sense that fread() was being called with a
variable-sized size argument, when it should be called with a
variable-sized nmemb argument.

Coverity issue: #1061517

https://bugzilla.gnome.org/show_bug.cgi?id=730381

matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server