virsh: Allow using VIR_AUTOPTR for releasing virDomainPtr in virsh

I opted to alias the 'virDomainType' to 'virshDomain' so that it's
obvious in all cases that this is a virsh-only construct. This is also
somewhat consistent with virsh's use of 'virshDomainFree' wrapper for
the freeing function which actually accepts NULL.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

tools/virsh-util.h

@@ -39,8 +39,11 @@ virshCommandOptDomain(vshControl *ctl,
                       const vshCmd *cmd,
                       const char **name);
 
+typedef virDomain virshDomain;
+
 void
 virshDomainFree(virDomainPtr dom);
+VIR_DEFINE_AUTOPTR_FUNC(virshDomain, virshDomainFree);
 
 void
 virshDomainCheckpointFree(virDomainCheckpointPtr chk);