uml: make a function static

arch/um/drivers/chan_kern.c::open_chan() can become static.
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: WANG Cong <wangcong@zeuux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/drivers/chan_kern.c

@@ -125,7 +125,7 @@ static int open_one_chan(struct chan *chan)
 	return 0;
 }
 
-int open_chan(struct list_head *chans)
+static int open_chan(struct list_head *chans)
 {
 	struct list_head *ele;
 	struct chan *chan;

arch/um/include/chan_kern.h

@@ -31,7 +31,6 @@ extern void chan_interrupt(struct list_head *chans, struct delayed_work *task,
 			   struct tty_struct *tty, int irq);
 extern int parse_chan_pair(char *str, struct line *line, int device,
 			   const struct chan_opts *opts, char **error_out);
-extern int open_chan(struct list_head *chans);
 extern int write_chan(struct list_head *chans, const char *buf, int len,
 			     int write_irq);
 extern int console_write_chan(struct list_head *chans, const char *buf,