[libvirt] [PATCH 2/5]: Properly set errors on unknown format types

[Chris Lalancette]

Because of my patch last week that converted the various virStorage*FromString
and virStorage*ToString implementations to the generic VIR_ENUM_IMPL, there were
a couple of places that didn't properly set errors when they failed.  This patch
fixes these places up.  It also adds an additional check in virEnumFromString(),
so that if a NULL type is passed in, it fails instead of SEGV'ing.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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