conf: Add the size of failed max_memory in error

If virDomainDefCompatibleDevice fails because there is insufficient
domain def->mem.max_memory, then let's also print out that value in
the error message.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
ACKed-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/domain_conf.c

@@ -28926,7 +28926,8 @@ virDomainDefCompatibleDevice(virDomainDefPtr def,
         if ((virDomainDefGetMemoryTotal(def) + sz) > def->mem.max_memory) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("Attaching memory device with size '%llu' would "
-                             "exceed domain's maxMemory config"), sz);
+                             "exceed domain's maxMemory config size '%llu'"),
+                           sz, def->mem.max_memory);
             return -1;
         }
     }