serial: 8250: Fix mismerge regarding serial_lsr_in()

The relevant history introducing serial_lsr_in() looks as follows:

	$ git log --graph --oneline --boundary 9fafe733..df36f3e3 -- drivers/tty/serial/8250/8250_port.c
	*   df36f3e3 Merge tag 'v5.19-rc3' into tty-next
	|\
	| * be03b065 serial: 8250: Store to lsr_save_flags after lsr read
	* | ...
	* | bdb70c42 serial: 8250: Create serial_lsr_in()
	* | ce338e44 serial: 8250: Store to lsr_save_flags after lsr read
	* | ...
	|/
	o 9fafe733 tty: remove CMSPAR ifdefs

So the patch "serial: 8250: Store to lsr_save_flags after lsr read" was
introduced twice and in one branch it was followed up by commit
bdb70c42 ("serial: 8250: Create serial_lsr_in()") which moved
explicit lsr_saved_flags handling into a new function serial_lsr_in().
When the two branches were merged in commit df36f3e3, we got both,
serial_lsr_in() and the explicit lsr_saved_flags handling.

So drop the explicit lsr_saved_flags handling.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230202104501.264686-1-u.kleine-koenig@pengutronix.de


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