s390/3215: simplify the return expression of tty3215_open()
Simplify the return expression. Link: https://lkml.kernel.org/r/20200921131101.93037-1-miaoqinglang@huawei.comSigned-off-by: Qinglang Miao <miaoqinglang@huawei.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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