[PATCH][next] mm: shmem: Fix error checking on utf8_parse_version failures

[Colin Ian King <colin.i.king@gmail.com>]

Currently the error check on the call to utf8_parse_version is always
false because version is an unsigned int and this can never be less
than zero. Because version is required to be an unsigned int, fix the
issue by casting it to int just for the error check.

Fixes: 58e55efd6c72 ("tmpfs: Add casefold lookup support")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 mm/shmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 7987deb2be9b..b69e1d8816fa 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4377,7 +4377,7 @@ static int shmem_parse_opt_casefold(struct fs_context *fc, struct fs_parameter *
 				       "in the format: utf8-<version number>");
 
 		version = utf8_parse_version(version_str);
-		if (version < 0)
+		if ((int)version < 0)
 			return invalfc(fc, "Invalid UTF-8 version: %s", version_str);
 	}
 
-- 
2.39.5