n_tty: Use DIV_ROUND_UP() in room calculation
When PARMRK is set, a character can result in up to 3 chars in the read buffer. Receive code calculates for how many characters there (at least) is room. Convert an opencoded rounding in the calculation to use DIV_ROUND_UP(). Note: the room variable is decremented afterwards by one which ensures the characters will fit into the buffer for real so the code is okay despite rounding upwards. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230309082035.14880-6-ilpo.jarvinen@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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