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The serial8250_update_uartclk() body was created based on the several
method calls copied from the serial8250_do_set_termios() function. Seeing
aside with some other things the later method can update the baud rate
based on the new reference clock let's just call it instead thus
simplifying the code a bit.
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/linux-serial/ZczD7KPbeRnY4CFc@black.fi.intel.com

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20240222145058.28307-1-fancer.lancer@gmail.com

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