uml: make a function static
arch/um/drivers/chan_kern.c::open_chan() can become static. Acked-by: NJeff Dike <jdike@addtoit.com> Signed-off-by: NWANG Cong <wangcong@zeuux.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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