[PATCH] Fixed '-serial none' usage breaks following '-serial ...' usage

[Bohdan Kostiv]

Hello,

I have faced an issue in using serial ports when I need to skip a couple of ports in the CLI.

For example the ARM machine netduinoplus2 supports up to 7 UARTS. 

Following case works (the first UART is used to send data in the firmware):

qemu-system-arm -machine netduinoplus2 -nographic -serial mon:stdio -kernel path-to-fw/firmware.elf

But this one doesn't  (the third UART is used to send data in the firmware):

qemu-system-arm -machine netduinoplus2 -nographic -serial none -serial none -serial mon:stdio -kernel path-to-fw/firmware.elf

The patch fixes the issue.

Best regards,
Bohdan

0001-Fixed-serial-none-breaks-following-serial.patch
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