[PATCH] tty: hvc: make symbol 'hvc_udbg_dev' static

The sparse tool complains as follows:

drivers/tty/hvc/hvc_udbg.c:20:19: warning:
 symbol 'hvc_udbg_dev' was not declared. Should it be static?

This symbol is not used outside of hvc_udbg.c, so this
commit marks it static.

Reported-by: Hulk Robot <redacted>
Signed-off-by: Yu Kuai <redacted>
---
 drivers/tty/hvc/hvc_udbg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/hvc/hvc_udbg.c b/drivers/tty/hvc/hvc_udbg.c
index a4c9913f76a0..ff0dcc56413c 100644
--- a/drivers/tty/hvc/hvc_udbg.c
+++ b/drivers/tty/hvc/hvc_udbg.c

@@ -17,7 +17,7 @@
 
 #include "hvc_console.h"
 
-struct hvc_struct *hvc_udbg_dev;
+static struct hvc_struct *hvc_udbg_dev;
 
 static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
 {

-- 
2.25.4