uio: make symbol 'uio_class_registered' static
Fixes the following sparse warning: drivers/uio/uio.c:277:6: warning: symbol 'uio_class_registered' was not declared. Should it be static? Fixes: ae61cf5b ("uio: ensure class is registered before devices") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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