make vfs_ustat() static

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/statfs.c b/fs/statfs.c
index fab9b6a..6327edf 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -216,7 +216,7 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user
 	return error;
 }
 
-int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
+static int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
 {
 	struct super_block *s = user_get_super(dev);
 	int err;