conf: Actually make virDomainChrSourceDef an object

In 2ada9ef1 we've tried to turn virDomainChrSourceDef into
virObject. Well, this requires 'virObject' member to be stored on
the first position of the struct. This adjustment is missing in
the original commit leading to all sorts of funny memleaks and
data corruptions.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>

src/conf/domain_conf.h

@@ -1180,6 +1180,7 @@ typedef virDomainChrSourceReconnectDef *virDomainChrSourceReconnectDefPtr;
 
 /* The host side information for a character device.  */
 struct _virDomainChrSourceDef {
+    virObject parent;
     int type; /* virDomainChrType */
     virObjectPtr privateData;
     union {