UPSTREAM: tty: serial: samsung: remove variable 'ufstat' set but not used

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/tty/serial/samsung_tty.c: In function s3c24xx_serial_rx_chars_dma:
drivers/tty/serial/samsung_tty.c:549:24: warning: variable ufstat set but not used [-Wunused-but-set-variable]

Bug: 144661360
Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Link: https://lore.kernel.org/r/1574424258-138975-1-git-send-email-chenwandun@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 98aee0c9444e5a5ce6de22cebc8071c8e140bcda)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I92f9e8a7d382cdd2b10f5bc275cf29e41af91cef