Do not ignore error, if open file failed (-serial /dev/tty)
In case, when qemu is executed with option like -serial /dev/ttyS0, report if there are problems with opening of devices. At now errors are silently ignoring. Signed-off-by: NEvgeniy Dushistov <dushistov@mail.ru> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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