[Libvir] [PATCH] Fix callers to virGetDomain and virGetNetwork

(1) Removes virGetDomainByID. This function was neither used nor exported. (2) virGetDomain sets a virterror connection error whenever anything bad happens (realistically malloc failure is the only thing that can go wrong). Therefore callers do not need to set virterror if the function returns NULL. The patch fixes these callers. (3) Same as (2), for virGetNetwork. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903