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

[Richard W.M. Jones]

(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.

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