Protect against NULL pointer flaws in monitor usage
Protect against NULL pointer flaws in monitor usage

History has shown that there are frequent bugs in the QEMU driver
code leading to the monitor being invoked with a NULL pointer.
Although the QEMU driver code should always report an error in
this case before invoking the monitor, as a safety net put in a
generic check in the monitor code entry points.

* src/qemu/qemu_monitor.c: Safety net to check for NULL monitor
  object

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