sysfs: Mark sysfs_attr_ns static

Nothing outside of fs/sysfs/file.c references this function, so mark it static.

Signed-off-by: Josh Triplett <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

fs/sysfs/file.c

···
 	.poll		= sysfs_poll,
 };
 
-int sysfs_attr_ns(struct kobject *kobj, const struct attribute *attr,
-		  const void **pns)
+static int sysfs_attr_ns(struct kobject *kobj, const struct attribute *attr,
+			 const void **pns)
 {
 	struct sysfs_dirent *dir_sd = kobj->sd;
 	const struct sysfs_ops *ops;