[arch/linux] uart: fix crash if device is wrong #1299
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if the serial port can't be openend (e.g. because the device is wrong/doesn't exist), set the reg_addr to NULL and properly check that everywhere should close paparazzi#1296
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if the serial port can't be openend (e.g. because the device is wrong/doesn't exist), set the reg_addr to NULL and properly check that everywhere
should close #1296