qemu: domain: Introduce helper to retrieve domain monitor object

In some cases where the function does not need to access the private
data this helper may be used to retrieve the monitor object.

src/qemu/qemu_domain.c

@@ -3034,3 +3034,16 @@ qemuDomainMemoryDeviceAlignSize(virDomainMemoryDefPtr mem)
 {
     mem->size = VIR_ROUND_UP(mem->size, 1024);
 }
+
+
+/**
+ * qemuDomainGetMonitor:
+ * @vm: domain object
+ *
+ * Returns the monitor pointer corresponding to the domain object @vm.
+ */
+qemuMonitorPtr
+qemuDomainGetMonitor(virDomainObjPtr vm)
+{
+    return ((qemuDomainObjPrivatePtr) vm->privateData)->mon;
+}

src/qemu/qemu_domain.h

@@ -252,6 +252,8 @@ void qemuDomainObjDiscardAsyncJob(virQEMUDriverPtr driver,
                                   virDomainObjPtr obj);
 void qemuDomainObjReleaseAsyncJob(virDomainObjPtr obj);
 
+qemuMonitorPtr qemuDomainGetMonitor(virDomainObjPtr vm)
+    ATTRIBUTE_NONNULL(1);
 void qemuDomainObjEnterMonitor(virQEMUDriverPtr driver,
                                virDomainObjPtr obj)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);