Don't overwrite errors raised by qemuMonitorHMPCommand
Don't overwrite errors raised by qemuMonitorHMPCommand

The qemuMonitorHMPCommand() API and things it calls will report
a wide variety of errors. The QEMU text monitor should not be
overwriting these errors

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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