Eric Blake 8f6c845f17 maint: avoid nested public calls
Having one API call into another is generally not good; among
other issues, it gives confusing logs, and is not quite as
efficient.

This fixes several instances, but not all: we still have instances
in both libvirt.c and in backend hypervisors (lxc and qemu) calling
the public virTypedParamsGetString and friends, which dispatch
errors immediately.  I'm not sure if it is worth trying to clean
that up in a separate patch (such a cleanup may be easiest by
separating the public function into a wrapper around the internal,
then tweaking internal.h so that internal users directly use the
internal function).

* src/libvirt.c (virDomainGetUUIDString, virNetworkGetUUIDString)
(virStoragePoolGetUUIDString, virSecretGetUUIDString)
(virNWFilterGetUUIDString): Avoid nested public API call.
* src/util/virtypedparam.c (virTypedParamsReplaceString): Don't
dispatch errors here.
(virTypedParamsGet): No need to reset errors.
(virTypedParamsGetBoolean): Use consistent ordering.

Signed-off-by: Eric Blake <eblake@redhat.com>
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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