drivers/misc: ti-st: Remove unneeded variable in st_tty_open

[ Upstream commit 8b063441b7417a79b0c27efc401479748ccf8ad1 ]

st_tty_open do not need local variable to store different value,
Hence just remove it.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Link: https://lore.kernel.org/r/1568307147-43468-1-git-send-email-zhongjiang@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: c83212d79be2 ("firmware: arm_sdei: Fix the input parameter of cpuhp_remove_state()")
Signed-off-by: Sasha Levin <sashal@kernel.org>