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Don't shadow error from serial8250_register_8250_port() and return it as is.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240812154901.1068407-3-andriy.shevchenko@linux.intel.com

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>