[PATCH] bdi: fix -Wformat-security

[Nick Desaulniers]

mm/backing-dev.c:810:57: warning: format string is not a string literal
(potentially insecure) [-Wformat-security]
dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
                                                       ^~~~~~~~~~~~~

Signed-off-by: Nick Desaulniers <nick.desaulniers@xxxxxxxxx>
---
Example patch showing off kernel development from a newly created twitch
stream! Check it out at: https://twitch.tv/ndesaulniers.

 mm/backing-dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 408d5051d05b..5755578d671d 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -807,7 +807,7 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
 		return 0;
 
 	vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);
-	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
+	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, "%s", bdi->dev_name);
 	if (IS_ERR(dev))
 		return PTR_ERR(dev);
 
-- 
2.25.1